What holds up
Practicing tennis is thought to promote increased longevity by combining intermittent physical exertion, bodily strengthening, continuous cognitive stimulation, and regular social interactions that break isolation.
This analysis is based directly on a large-scale prospective cohort study, the Copenhagen City Heart Study (2018), which followed more than 8,500 participants for 25 years. This type of observational evidence shows that playing tennis is correlated with an estimated gain in life expectancy of 9.7 years compared to a sedentary lifestyle. Although this is a correlation and not a direct causality, research suggests that this positive impact is largely explained by the strong social interactions required by the sport. Physically, the alternation of short, intense efforts stimulates endurance, while repeated footwork reinforces the strength and structure of the body. The constant challenges of coordination and rapid decision-making engage cerebral plasticity, promoting mental vitality. Finally, the collective dimension of tennis proves to be an excellent way to cultivate regular human relationships, a key ingredient for lasting well-being.
Preserve the long-term health and vitality of your skin through a routine of regular hydration and protection against environmental stressors, rather than aiming for superficial aesthetic perfection.
This approach, focused on long-term skin vitality rather than fleeting visual perfection, is solidly validated by science. An expert consensus review published in the *Journal of Clinical and Aesthetic Dermatology* notes that targeted daily hydration strengthens the skin's protective barrier by limiting transepidermal water loss. Furthermore, a systematic review of the literature published in 2026 demonstrates that the daily use of broad-spectrum sunscreen (SPF 30+) is the most proven strategy for preventing premature skin aging. Nutritionally, a 2025 meta-analysis confirms that essential fatty acid intake supports skin structure and elasticity from within. However, the accumulation of complex formulas or expensive products is often superfluous: randomized clinical trials indicate that a gentle, minimalist routine is more than sufficient to maintain this balance. In short, the emphasis on protection and the maintenance of a healthy hydration barrier is scientifically impeccable for preserving one's skin capital.
Do not let your hair air dry; instead, use a hair dryer set to a low temperature, held at a distance of 15 cm.
This recommendation is based on a rigorous experimental study published in 2011 in the scientific journal Annals of Dermatology by Yoon-Hee Lee’s team. The researchers compared different drying methods and demonstrated that natural air drying keeps the hair fiber saturated with water for too long, causing prolonged swelling that weakens its internal structure. Conversely, using a hair dryer at a moderate temperature (approximately 47 °C) at a distance of 15 cm with continuous movement prevents this swelling without damaging the hair's outer cuticle. However, the absolute claim that one should 'never' air dry hair is slightly exaggerated, as the actual impact varies depending on hair type, thickness, and porosity. Cosmetic science instead suggests a hybrid method: remove excess water by gently pressing the hair with a microfiber towel, then finish with warm, mobile drying.
To optimize radiance and skin texture, it is advisable to select the correct exfoliating acid (AHAs for the surface and hydration, BHAs to purify pores) and to use a targeted retinoid duo to diminish fine lines while limiting the risk of irritation.
The concept of personalizing one's routine with specific acids is based on very solid cosmetic foundations. According to a clinical study published in the Journal of Cosmetic Dermatology (2024), the use of appropriate exfoliants significantly improves skin texture and radiance without compromising the protective barrier. AHAs even out the cutaneous surface, while BHAs effectively target congested pores and blemishes. Regarding the retinoid duo, a randomized double-blind clinical trial (RCT) published in MDPI (2026) confirms that combining different forms of vitamin A (such as retinol and retinal) can match or even surpass the efficacy of standard formulas while greatly reducing skin discomfort. The only nuance lies in the promise to completely limit irritation, as tolerance always depends on individual sensitivity, concentration, and the gradual integration of active ingredients. Overall, this advice is an excellent strategy validated by research for preserving skin youthfulness.
A decrease in the overall density of your hair can be a telltale sign of ongoing hair loss.
This advice is based on a simple physiological reality: a decrease in hair density is the most direct visual sign that your hair renewal cycle is disrupted. According to practical guides from the American Academy of Dermatology (expert opinion), a decrease in volume or a widening hair part are the first signals of shedding that exceeds the norm. For its part, the Mayo Clinic confirms (expert opinion) that observing overall density is a reference method for identifying nascent hair vitality loss. Observational studies also show that our natural density evolves with age and heredity, which makes observing our own variations very relevant. It is worth noting, however, that a temporary decrease in density, often linked to stress or the seasons, generally resolves itself once balance is restored. Monitoring the evolution of one's volume over the months therefore remains an excellent habit for adapting one's hair care routine.
Avoid sleeping with wet hair to prevent hair fiber breakage and preserve the balance of the scalp.
This recommendation is based on solid biophysical principles, although it has not been directly studied in large-scale randomized clinical trials (RCTs). Structurally, water causes the hair fiber to swell and lifts its protective cuticles, making the hair highly vulnerable to repeated friction against a pillow, as explained by Dr. Timothy Schmidt of the University of Utah (expert opinion). Furthermore, retaining moisture overnight creates a warm and humid microclimate. Specialists at the Cleveland Clinic (expert opinion) note that this environment encourages the growth of natural microorganisms, such as the yeast Malassezia, which can cause dandruff or irritation. While the popular belief associating wet hair with catching a cold is scientifically unproven, Carla Valette's advice is perfectly sound for optimizing hair vitality.
To mitigate sebaceous filaments on the nose, one must absolutely avoid manual extraction by squeezing—which damages the skin and enlarges the pores—and instead prioritize a gentle, targeted cosmetic routine.
Skincare science fully validates this warning against manual extraction. According to expert guides from the Cleveland Clinic (expert opinion), squeezing these delicate areas to extract sebum can alter the skin barrier, permanently enlarge pores, and leave stubborn marks on the face. Observational data in aesthetics also shows that these filaments are healthy and natural structures essential for transporting sebum; when emptied by force, they systematically reform within three to five days (observational evidence). To harmonize skin texture without irritation, recommendations from skincare brands like Dermalogica instead prioritize double cleansing with oil, which gently dissolves oily impurities. Furthermore, the use of gentle exfoliants such as salicylic acid (BHA) is scientifically recognized to refine the appearance of pores on the surface without disrupting the skin's balance.
Skin appears more beautiful, smooth, and plump upon waking in the morning because the reclined position during sleep evenly distributes bodily fluids toward the face, which temporarily fills in fine lines before gravity causes these fluids to drain back down over the course of the day.
This observation is based on fascinating biological realities related to gravity and our body's fluid dynamics. An observational clinical study by Tsukahara et al. (published in 2001 in the British Journal of Dermatology) demonstrated that facial skin thickness is significantly higher in the morning than in the afternoon. During the night, the horizontal position allows body fluids (interstitial water) to distribute homogeneously, which slightly and naturally swells facial tissues. Another clinical study by the same author (2004, Archives of Dermatological Research) confirms that forehead and eye-contour fine lines are measurably less deep upon waking thanks to this natural swelling phenomenon. However, this 'plumping' effect is ephemeral because gravity quickly causes these fluids to drain downward as soon as we spend the day standing. The idea of optimal hydration should also be nuanced: research shows that water loss via evaporation is actually higher during the night, making the skin barrier drier upon waking despite the plump appearance.
Never share your mascara to maintain ocular hygiene and avoid the transfer of germs.
The opinion of experts from the American Academy of Ophthalmology fully corroborates this advice, noting that sharing eye cosmetics is one of the primary vectors for germ transfer. A randomized pilot study published in the journal Optometry demonstrated that after three months of regular use, more than 36% of mascara tubes showed microbial proliferation. Furthermore, an observational study published in the Journal of Applied Microbiology revealed that a vast majority of used makeup products harbored diverse microbial flora. By sharing an applicator, one creates a direct bridge between the skin flora of two individuals, facilitating a cross-transfer of impurities. This simple action can disrupt the eye's natural protective barrier, leading to discomfort, redness, or increased sensitivity. Experts recommend treating mascara as a strictly personal tool, ideally replaced every three months to preserve the freshness and purity of the ocular area.
To avoid disappointment with laser hair removal, it is necessary to understand that it does not provide 100% absolute and eternal elimination of all hair, but rather offers a major and long-lasting reduction in hair growth.
Carla Valette's statement is entirely accurate and aligns perfectly with scientific and regulatory data. In fact, the FDA (the American regulatory authority) does not authorize the term 'permanent' hair removal for lasers, but only validates 'permanent hair reduction,' defined as a long-lasting and stable decrease in the number of hairs. In this regard, a meta-analysis of randomized controlled trials published in the Journal of Cosmetic and Laser Therapy in 2023 confirms that laser technologies are highly effective at decreasing hair density compared to no treatment. Another systematic review published in the British Journal of Dermatology highlights that this effectiveness varies according to the natural growth cycles specific to each area of the body. In reality, while an 80 to 95% reduction is generally observed after a full protocol, the elimination is never 100% absolute. Hormonal variations or the activation of previously dormant hair follicles can lead to slight regrowth over the years, requiring simple maintenance sessions. Adjusting expectations to aim for a major reduction rather than a magical and eternal disappearance is therefore scientifically justified.
Pregnancy changes the nature, texture, and thickness of hair due to hormonal variations.
The idea that hair behavior and texture change during pregnancy is scientifically accurate. Observational studies, notably one published in the Journal of the European Academy of Dermatology and Venereology, show that the rise in estrogen prolongs the natural growth phase of hair, limiting shedding and temporarily giving it a denser appearance. These intense hormonal variations can also temporarily change the shape of the follicles, which explains why hair may become wavier or straighter during these nine months. After childbirth, the gradual drop in hormones triggers a resting phase for the hair, leading to classic transient shedding before a return to equilibrium. While this biological phenomenon is real, the use of styling or protective products remains primarily a matter of cosmetic comfort to manage these daily variations. The hair fiber eventually returns naturally to its original texture and density a few months after birth, with no external treatment being biologically necessary.
Protecting your ears from excessive noise helps preserve your non-regenerative auditory cells, which assists in maintaining mental sharpness and preserving memory over the long term.
Carla's advice is based on particularly solid scientific foundations. Hair cells in the human inner ear indeed do not regenerate after being damaged by intense noise, making hearing loss permanent. Regarding the link to brain health, the report from the prestigious Lancet Commission on dementia prevention (2024 update, expert opinion) identifies midlife hearing loss as the primary modifiable factor to address in order to preserve mental sharpness while aging. Furthermore, several meta-analyses of observational studies (such as the one published in JAMA Otolaryngology) confirm the close association between hearing loss and a decline in memory faculties. Finally, the importance of prevention is demonstrated by the ACHIEVE randomized controlled trial (2023), which shows that protecting or correcting one's hearing helps slow brain aging in older adults. This message is therefore perfectly validated: taking care of your ears today is a key action for the longevity of your mind.
It is useless to invest in other cosmetic products (skincare) if you do not apply sunscreen daily to protect your skin.
The assertion that sunscreen is the essential pillar of any beauty routine is scientifically indisputable. UV exposure is estimated to be responsible for nearly 80% to 90% of the visible signs of premature skin aging, such as loss of firmness or the appearance of pigment spots. Regarding clinical evidence, a benchmark randomized controlled trial conducted by Hughes et al. over 4.5 years (published in the Annals of Internal Medicine) demonstrated that daily application of broad-spectrum sunscreen reduces visible skin aging by 24% compared to occasional use. Furthermore, a prospective study published in Dermatologic Surgery by Randhawa et al. shows that daily use of an SPF over one year improves skin clarity and texture by 40% to 52%, thus revealing a regenerative effect. Finally, the use of 100% mineral filters is particularly validated by expert opinion for correcting the appearance of redness while respecting the skin barrier of reactive or fragile skin. Therefore, not using sun protection effectively renders the other efforts in your skincare ritual futile.
Deliberately delaying one's bedtime by staying awake to watch series or scroll through social media (the phenomenon of bedtime procrastination).
The phenomenon shared by Carla is scientifically well-documented under the name 'bedtime procrastination' (or 'revenge bedtime procrastination'), a concept formalized in 2014 by the team of researcher Floor Kroese. A 2022 meta-analysis conducted by an international team confirms that this habit is directly correlated with shorter nights, poorer recovery, and a feeling of daytime fatigue. Regarding the direct impact of screens, a vast 2025 observational study published in Frontiers in Psychiatry shows that nocturnal smartphone use and streaming in bed significantly reduce the duration and overall quality of our rest. Furthermore, work led by Liu in 2025 demonstrates that the duration of social media use right before turning off the lights is one of the major triggers for this voluntary delay. Behavioral research explains this need as a quest for compensation: after a busy day, scrolling becomes a way to grant oneself a moment of personal freedom. Carla's observation is therefore perfectly validated by science, which instead suggests we cultivate real moments of disconnection during the day to protect our evenings.
Adopt a simplified (minimalist) skincare routine focused on the essentials to soothe blemishes, rather than layering complex cosmetic products.
The idea of simplifying one's skincare routine, sometimes called 'skinimalism,' is a very interesting approach to caring for skin without irritating it. A randomized controlled trial (RCT) led by Messaraa and published in the Journal of Cosmetic Dermatology shows that while complex routines have value for very specific concerns, a simplified routine (a cleanser and a moisturizer) is already successful at maintaining an excellent protective barrier. Furthermore, many skincare expert opinions highlight that accumulating strong active ingredients (such as several acids applied simultaneously) disrupts the natural balance of the epidermis and can paradoxically generate blemishes. By limiting daily steps to cleansing, moisturizing, and sun protection, one avoids undesirable interactions between ingredients. It is therefore a gentle and effective method for allowing the skin to regenerate on its own throughout its natural cycle. Although advanced routines remain useful for targeted needs, simplification remains an excellent strategy for regaining a soothed complexion.
What's more nuanced than that
Adjust the water temperature when washing your hair (choosing between hot and cold water) to preserve shine and protect the hair fiber.
The idea that water temperature must be adjusted is based on a persistent popular belief, but hair science strongly qualifies these benefits. On one hand, beauty experts agree that one should avoid very hot water, as it strips natural oils from the scalp, leading to dryness and frizz. On the other hand, the myth that cold water closes cuticles to boost shine is contradicted by concrete data. An experimental study conducted by the research institute TRI Princeton demonstrated that rinsing hair at less than 18°C provided no additional luster compared to lukewarm water, with the latter even removing product residue more effectively. Biologically, the external hair fiber is a dead structure (keratin) and does not possess a thermal mechanism to actively open or close its scales. Finally, specialists at the Philip Kingsley trichology clinic (expert opinion) suggest that ice-cold water can temporarily contract the blood vessels of the scalp, anecdotally limiting nutrient supply without proof of actual harm to hair growth.
Use specific detoxifying and chelating shampoos (such as L'Oréal Metal Detox or OUAI Detox) to remove hard water mineral deposits that dull and damage hair.
Minerals (calcium and magnesium) deposit on the hair fiber, creating a film that makes hair dull, coarse, and difficult to hydrate, a fact supported by observational studies published in the International Journal of Dermatology. Furthermore, the efficacy of chelating ingredients (such as EDTA or citric acid found in these detox shampoos) in binding and removing these mineral deposits is based on well-established cosmetic chemistry data and a broad consensus among hair care experts. However, the idea that mineral deposits damage the internal structure of the hair is sometimes exaggerated. A comparative trial published in PMC (Srinivasan et al.) revealed that prolonged exposure to hard water did not significantly alter the strength or elasticity of the hair fiber compared to distilled water. Finally, while formulas like L'Oréal Metal Detox scientifically target metals (such as copper), evidence of efficacy specific to each product cited for removing mineral deposits compared to an ordinary clarifying shampoo lacks published independent data. Using these detox treatments remains, nonetheless, an excellent wellness routine for restoring shine and suppleness to weighed-down hair.
The efficacy of an LED mask (red and infrared light) relies on photobiomodulation to stimulate collagen and regenerate the skin, provided the correct dose of energy (fluence) is delivered using a high-quality device.
The principle of photobiomodulation via red and infrared light is now well-documented in skin science. A meta-analysis by Barolet et al. (2022) confirms the efficacy of this technology in stimulating collagen production and improving skin appearance. Furthermore, a randomized controlled trial conducted by Park et al. (2025) demonstrated that regular at-home use of LED masks provides measurable improvements in firmness and fine lines. The creator’s emphasis on 'fluence' (the correct dose of energy delivered) is scientifically accurate. According to the biological law of the biphasic response, a dose that is too low remains inactive, while an excessive dose may saturate cells without benefit. However, it should be noted that at-home results remain gradual and require high consistency. Finally, while the brand mentioned presents encouraging internal studies, independent comparative data are lacking to prove its superiority over other masks on the market.
Practice 'double shampooing' by using clarifying or detoxifying products to bind and thoroughly remove impurities accumulated on the scalp and hair fiber.
In terms of cosmetic formulation, the principle of surfactants binding to fatty substances (sebum, pollution) to rinse them away with water is scientifically validated. The first wash removes this surface layer, while the second cleans the scalp more deeply, as confirmed by analyses from the hair research institute TRI Princeton. This is also why the second wash generally lathers much more, as the surfactants are no longer saturated by surface oil. However, the systematic use of so-called 'clarifying' or detoxifying shampoos for this double wash is considered excessive. Experts like dermatologist Dr. Joel Schlessinger point out that these powerful formulas, if used too often, risk stripping away the natural protective lipids of the hair fiber. This can lead to dryness or scalp sensitivity. For a balanced routine, research suggests reserving this method for occasional needs (buildup of styling products) and using gentle formulas for daily use.
Wearing high-heeled shoes is directly linked to the onset of foot pain and discomfort, but it is possible to mitigate these physical inconveniences by adapting one's habits.
Scientific research fully validates the direct association between wearing high heels and the occurrence of physical foot discomfort. A vast meta-analysis published in the journal BMC Public Health (2023) confirms that heel elevation shifts the center of gravity forward, massively increasing the load on the forefoot and altering overall stability. Furthermore, a clinical study published in Scientific Reports (2024) identifies very precise thresholds: the sensation of discomfort intensifies critically after 3.5 hours of continuous use or as soon as the heel height exceeds 7.5 centimeters. As for popular tips often promoted online to completely eliminate this discomfort—such as taping certain toes together—podiatry specialists agree that they lack rigorous scientific evidence. While these makeshift methods may limit local friction, they do not negate the real physical stresses exerted on the structure of the foot. To maintain daily comfort, science instead recommends alternating types of footwear, using supportive insoles to better distribute weight, or opting for wider heels that naturally stabilize posture.
To repair damaged and brittle hair without having to cut it, use the three-step Lao Care treatment (shampoo, mask, and leave-in cream) enriched with Pepticare®, a patented active ingredient designed to regenerate the keratin in the hair fiber from within.
The use of plant proteins and peptides to strengthen hair structure is well-supported by science (type of evidence: in vitro experimental studies). The patented active ingredient Pepticare®, developed by the brand Lao Care based on camelina seed extracts, has demonstrated in instrumental tests (conducted in collaboration with the CNRS on hair swatches) its ability to consolidate up to 73% of broken disulfide bonds. However, the use of the term 'regenerate' remains a marketing exaggeration, as the visible hair fiber is biologically inert matter that lacks any cellular self-healing mechanism. These products act instead as an excellent molecular 'cement' that temporarily improves mechanical resistance and elasticity against brushing or heat. Furthermore, the idea that this treatment consistently eliminates the need for a haircut is overstated, as for severely split ends, cutting remains the only definitive solution. Finally, although these laboratory results are very interesting, the overall efficacy here relies on instrumental data from the manufacturer rather than published independent clinical trials.
Measure your overall biological age and the aging rate of your various organs (brain, heart, muscles) using an at-home epigenetic test ("SystemAge" by Generation Lab) in order to personalize your wellness and longevity choices.
The concept of measuring overall biological aging via epigenetics (DNA methylation) is scientifically compelling and based on robust observational studies popularized by researchers such as Steve Horvath. Furthermore, Generation Lab's technology stems directly from the academic work of Dr. Irina Conboy (University of California, Berkeley) on cellular biological noise. Nevertheless, the promise of isolating the biological age of 21 distinct organs or systems from a simple at-home blood sample is particularly ambitious and remains far ahead of scientific consensus. Industry experts such as Dr. Hillary Lin further note that current epigenetic measurement algorithms lack standardization and can yield highly variable scores. For now, while it is observationally proven that diet or exercise positively influence our global clock, no randomized clinical trial (RCT) has yet validated the long-term efficacy of an action plan targeted at the age of a specific organ.
To soothe irritation and breakouts around the mouth (perioral dermatitis), there is no need to multiply products: a minimalist approach based on 3 rules ('zero therapy,' stopping creams containing cortisone, and using very gentle skincare or fluoride-free toothpaste) is sufficient to restore healthy skin.
The idea of drastically simplifying one's skin routine, often called 'zero therapy,' is widely validated for soothing irritation and small breakouts around the mouth. A review of scientific literature published on PubMed ('Evidence-based review of perioral dermatitis therapy') confirms that completely stopping cosmetics and complex creams is the most effective method for restoring the skin's protective barrier in cases of mild discomfort. Furthermore, avoiding creams containing cortisone is crucial: observational data compiled by StatPearls show that these formulas provide ephemeral relief followed by a severe rebound effect that maintains skin irritation. The exclusion of fluoride in oral hygiene is also supported by clinical observations, as illustrated by a case study from the Australian Dental Journal, showing the disappearance of redness after discontinuing a fluoridated toothpaste. However, claiming that 'only 3 things' are enough for everyone is slightly exaggerated. For more persistent skin imbalances, a clinical synthesis published in the PubMed database ('Perioral dermatitis: still a therapeutic challenge') indicates that targeted supportive care sometimes proves essential to help the skin regain its natural balance.
Applying heat via a blowout enhances the hair and is the secret to making hair look particularly beautiful.
Aesthetically, the heat from a blowout works by temporarily breaking and reforming the hydrogen bonds in the hair fiber to smooth it, which aligns the cuticles and allows for better light reflection. Surprisingly, an experimental comparative study conducted by Lee et al. (2011) in the *Annals of Dermatology* demonstrates that moderate blow-drying (at 15 cm with continuous motion) preserves the internal cell membrane complex of the hair better than passive air-drying, because prolonged moisture weakens the fiber structure. However, the idea that heat in itself is an absolute factor for embellishment is exaggerated. Physical structural analyses (such as the in vitro thermal study by Bories et al., 1984) prove that beyond a critical threshold situated between 140°C and 180°C, heat irreversibly denatures keratin. At these high temperatures, the cuticle cracks, which destroys the natural shine. There is no evidence that high heat provides any biological benefit; without the use of a heat-protectant product to diffuse the temperature, it causes deep dehydration of the fiber.
Consume creatine monohydrate powder diluted in water daily to support brain health and boost cognitive functions.
The value of creatine for the mind is based on its key role in cellular energy production, which is essential for the vitality of our neurons. An exhaustive meta-analysis conducted by Xu et al. in 'Frontiers in Nutrition' (2024) shows that this supplementation can indeed support memory and processing speed. Nevertheless, these clinical findings indicate that the effect is most pronounced in situations of mental fatigue, sleep deprivation, or aging. For a young, well-rested, and active person, the immediate benefits for daily mental clarity remain very subtle. Furthermore, as Dr. Rhonda Patrick's syntheses note, the brain's protective barrier limits the effective absorption of this compound. Standard doses of 3 to 5 grams, which are ideal for physical tone, often prove insufficient to increase cerebral creatine levels, necessitating more generous intakes for real effects. Presenting creatine as a universal brain stimulant for everyone is therefore an oversimplification, even if it is an excellent tool for general vitality.
If you sleep 8 hours a night but remain tired, the solution is to track and analyze your sleep holistically by connecting your various devices (watches, rings, phones) on a single platform.
The value of using connected technologies to assess rest is scientifically grounded: a 2026 meta-analysis evaluating sleep trackers confirms that they provide reasonable overall estimates of sleep duration. Furthermore, a randomized controlled trial (RCT) published in the Journal of Clinical Sleep Medicine demonstrated that tracking via wearable sensors significantly improves users' subjective perception of sleep quality. However, presenting the centralization and analysis of this data as the direct solution to persistent fatigue is an exaggeration. The 2026 meta-analysis indeed notes that these devices tend to overestimate actual sleep time and still lack the fine precision to distinguish deep recovery cycles. Finally, fatigue despite 8 hours of sleep often stems from broad lifestyle factors (such as stress levels or light exposure) that simple technological observation alone cannot correct.