Attractiveness is not a single trait you either have or lack. Research across psychology, biology, and behavioral science consistently shows that perceived attractiveness is a composite of dozens of signals, many of which you can deliberately change. Some are as straightforward as sleeping more or eating differently; others involve how you stand, how you speak, and even who you stand next to. The science here is surprisingly practical, and several of the most effective levers have nothing to do with bone structure or genetic luck.
Get More Sleep
If you want a single change with outsized returns, start with your sleep schedule. A study published in the BMJ photographed people after a normal night’s rest and again after a period of sleep deprivation, then asked strangers to rate both sets of photos. Sleep-deprived faces were rated about four percent less attractive and six percent less healthy-looking, with perceived tiredness jumping by roughly nineteen percent.1PubMed Central. Beauty sleep: experimental study on the perceived health and attractiveness of sleep deprived people Four percent sounds modest until you consider it was produced in a single night and was immediately visible to complete strangers.
A separate study using a similar design found that sleep-restricted people were not only rated as less attractive and less healthy but that strangers were less willing to socialize with them.2PubMed Central. Negative effects of restricted sleep on facial appearance and social appeal The researchers speculated that subtle cues like hanging eyelids, redder eyes, and paler skin act as unconscious social signals. You do not need to look terrible after a bad night of sleep for people to pick up on it. The effect is quiet but reliable.
Eat More Fruits and Vegetables
This one sounds like advice from a parent, but the mechanism is genuinely interesting. Fruits and vegetables rich in carotenoids, the pigments responsible for the orange and yellow hues in carrots, sweet potatoes, and tomatoes, end up deposited in your skin after you eat them. That deposition gives your complexion a slightly warmer, more golden tone, and research shows this tone is reliably rated as more attractive and healthier-looking.3PubMed Central. It is all in the face: carotenoid skin coloration loses attractiveness outside the face The effect is specific to faces; when the same color shift was applied to scrambled, non-face images, people did not find it more appealing, which suggests it is not just a preference for warm colors in general.
What makes this actionable is the speed. Dietary changes can produce a perceptible shift in skin color within weeks.4PubMed Central. Attractive skin coloration: harnessing sexual selection to improve diet and health The research has mostly been conducted in lighter-skinned populations, so the visual effect is more noticeable there, but the underlying biology of carotenoid deposition applies broadly. Higher cardiovascular fitness and lower body fat also contribute to a skin color that observers judge as healthier.5Frontiers in Psychology. Skin Color Cues to Human Health: Carotenoids, Aerobic Fitness, and Body Fat So the advice really collapses to something simple: eat well, exercise, and your face will show it.
How You Smell Reflects What You Eat
The diet-attractiveness connection does not stop at your skin. In a study where women rated the body odor of men on different diets, men who ate more fruits and vegetables produced sweat that was rated as more pleasant-smelling, with floral, fruity, and sweet qualities. Greater carbohydrate intake was associated with stronger, less pleasant odor.6Evolution and Human Behavior. Diet quality and the attractiveness of male body odor A separate experiment found that red meat consumption made body odor significantly less attractive to raters compared to a non-meat diet.7Chemical Senses. The Effect of Meat Consumption on Body Odor Attractiveness
Fragrance matters too, but perhaps not only in the way you expect. When men used a fragranced body spray, they were rated not just as better-smelling but as more attractive and as having higher self-esteem.8PubMed Central. The role of fragrance and self-esteem in perception of body odors and impressions of others Part of the effect was chemical, but part of it seemed to be behavioral: people who feel they smell good carry themselves differently, and others notice.
Stand Tall and Take Up Space
Your posture may be doing more work for your attractiveness than your outfit. In a speed-dating study of 144 dates, researchers coded participants’ nonverbal behavior from video and found that postural expansiveness, meaning an open, space-claiming body position, was the single strongest predictor of romantic attraction. Each one-unit increase in expansiveness nearly doubled a person’s odds of getting a “yes” from their partner.9PubMed Central. Dominant, open nonverbal displays are attractive at zero-acquaintance The researchers then tested this on a dating app, photographing the same people in expansive and contracted postures. Users swiping through photos were significantly more likely to select the expansive-posture version of the same person. The appeal seems to work through perceived dominance and confidence, though “dominant” here means socially comfortable, not aggressive.
The way you walk tells a similar story. Research on gait and attractiveness found that an upright pelvic posture while walking produced significantly higher aesthetic ratings than a slouched or posteriorly tilted posture, and this effect was large enough to be independent of body shape.10Scientific Reports. Gait pattern can alter aesthetic visual impression from a third-person perspective For women specifically, attractiveness in walking was linked to a combination of lumbar curvature, cadence, backward arm swing, and a slight forward tilt of the head.11Scientific Reports. Structural equation modeling of female gait attractiveness using gait kinematics In other words, people who move in a way that looks energetic, upright, and fluid are consistently rated higher, even when their body shape is held constant.
Facial Hair Has a Sweet Spot
For men wondering whether to grow a beard or grab a razor, the research points to an intermediate length. One study found that light stubble was rated as the most attractive facial hair condition, preferred for both short-term and long-term relationships, while full beards were seen as most masculine and socially mature.12Personality and Individual Differences. The effects of facial hair manipulation on female perceptions of attractiveness, masculinity, and dominance in male faces A larger study came to a slightly different answer: women judged heavy stubble as the most attractive, with clean-shaven faces, light stubble, and full beards all rated similarly lower. That same study found that full beards scored highest for perceived parenting ability and healthiness.13Evolution and Human Behavior. The role of facial hair in women’s perceptions of men’s attractiveness, health, masculinity and parenting abilities
A more recent experiment specifically tied light stubble to increased perceived trustworthiness and attractiveness, but only in younger men. For older men, the effect was weaker or absent.14PubMed. Is beard the male makeup? An experimental study on trust perception based on appearance The takeaway across these studies is consistent in direction if not in exact detail: somewhere between clean-shaven and a full beard sits the most attractive zone for most women evaluating most men. Full beards are not unattractive, but they communicate something different, more maturity and protectiveness than raw appeal.
Your Voice Sends More Signals Than You Think
Vocal pitch is one of the most studied acoustic cues in attractiveness research, and the findings split neatly by sex. For men, lower-pitched voices are rated as more attractive. In one study, lowering the fundamental frequency of male voices increased perceived masculinity, size, and age, and peer-group women preferred the lower-pitched versions.15Animal Behaviour. Manipulations of fundamental and formant frequencies influence the attractiveness of human male voices A large analysis confirmed this, finding that pitch was negatively correlated with men’s vocal attractiveness, meaning deeper voices consistently scored higher.16PubMed Central. No evidence that averaging voices influences attractiveness
For women, the picture is slightly more nuanced. Higher pitch was correlated with attractiveness in the study above, but a separate analysis found the effect of pitch on female vocal attractiveness to be tiny, with breathier voice quality and certain vowel characteristics playing a larger role.17PLOS ONE. Towards a More Nuanced View of Vocal Attractiveness Male voices that used shorter average word durations were also rated as more attractive, suggesting that speaking efficiently, without dragging out syllables, matters. You cannot easily change your pitch, but you can work on speaking pace, breathiness, and resonance, all of which influence how your voice lands.
Your Teeth and Your Smile
Teeth research on attractiveness produces some mixed results, which is actually useful to know before you spend money on whitening. One study found that deviation from normal tooth spacing and yellowed coloration both hurt attractiveness ratings, but whitening teeth beyond their natural color did not help. The negative judgments were driven by increased yellowing, not by a failure to be whiter than normal.18PubMed Central. Evidence to Suggest That Teeth Act as Human Ornament Displays Signalling Mate Quality An older study went further, finding no effect of tooth color on attractiveness ratings at all, and concluded that unless whitening boosts your own confidence, it may not change how others see you.19PubMed. Tooth color: effects on judgments of attractiveness and age
A more recent cross-sectional survey did find that lighter tooth shades were consistently rated as more attractive across both genders, though the preference was stronger among younger raters and among women.20PubMed Central. The relationship of tooth shade and skin tone and its influence on smile attractiveness in native South Indians The honest read of this research is that avoiding visibly yellowed or crooked teeth does matter, but chasing Hollywood-white veneers probably yields diminishing returns. Good oral hygiene gets you most of the way there.
Protect Your Skin From the Sun
If you want to look younger for longer, sunscreen has better evidence behind it than almost any skincare product. A randomized trial followed adults who either applied sunscreen daily or used it at their own discretion over four and a half years. At the end of the trial, the daily-sunscreen group showed no detectable increase in skin aging, while the discretionary group aged visibly. Daily use resulted in about 24 percent less skin aging over the trial period.21PubMed. Sunscreen and prevention of skin aging: a randomized trial This is a rare case of a cosmetic-adjacent claim that comes from a proper randomized trial rather than a before-and-after testimonial. The effect compounds over years, which means starting earlier matters more than the specific brand you use.
Be Kind and Be Funny
One of the most robust and underrated findings in attractiveness research is that personality information changes how physically attractive someone appears, not just how desirable they are as a partner but how beautiful their face literally looks to raters. Across ten studies with over 4,000 participants, people depicted as prosocial were judged as more physically beautiful.22PubMed Central. Prosocial behaviour enhances evaluation of physical beauty A separate study confirmed a causal effect: prosocial behavior increased perceived attractiveness, and people who already believed attractive individuals are kind showed the strongest effect, creating a self-reinforcing cycle.23Journal of Economic Behavior & Organization. The beauty of prosocial behavior: The bi-directional link between attractiveness and prosocial behavior
Humor works through a related pathway. Research on partner desirability found that people strongly preferred partners who were good at producing humor, with the effect particularly pronounced for women evaluating men in long-term relationship contexts. The ability to produce humor mattered more than the ability to appreciate someone else’s humor. And critically, ratings of physical attractiveness themselves shifted upward under favorable humor conditions.24PubMed Central. Effects of Humor Production, Humor Receptivity, and Physical Attractiveness on Partner Desirability Being genuinely funny does not just make you more fun to be around; it makes you look better to the people laughing.
Wear Red
The “red-attractiveness effect” has been documented across multiple cultures. In a controlled experiment, opposite-sex targets wearing red were rated as more attractive than the same targets in white.25PubMed. Contextual modulation of the red-attractiveness effect: Differences in affiliation and competitive settings The effect is not enormous, and context matters: the study found that it held in both affiliative and competitive settings but was modulated by the social frame. Still, if you are choosing between two shirts and one is red, the science gives red a slight edge. It is one of the easiest and lowest-effort interventions on this list.
Make Eye Contact
Eye contact during initial interaction influences who people choose to spend time with. In an early but foundational experiment, participants asked to choose partners for a task were significantly more likely to pick someone who had made eye contact during the introduction. Both men and women also preferred partners with dilated pupils, a signal associated with interest and arousal.26Psychonomic Science. Eye contact, pupil dilation, and personal preference You cannot control your pupil size, but you can control whether you look someone in the eye when you meet them.
The Cheerleader Effect Is Real
You have probably heard the idea that people look more attractive in groups than alone. It is not just a sitcom joke. Multiple studies have confirmed that individual faces are rated as more attractive when presented alongside other faces in a group compared to when presented in isolation.27PubMed. Hierarchical encoding makes individuals in a group seem more attractive The effect held regardless of where the face appeared in the group.28Scientific Reports. Visuospatial asymmetries do not modulate the cheerleader effect The leading explanation is that our visual system averages the features of a group, and since averaged faces tend to be perceived as more attractive, each individual member benefits from a kind of perceptual smoothing. It may also involve memory bias: when we recall a face from a group, we slightly blend it toward the group average.29PubMed. The “cheerleader effect” in facial and bodily attractiveness: A result of memory bias and not perceptual encoding The practical implication is straightforward: group photos on a dating profile or showing up with friends to a social event is not vanity, it is perceptual science working in your favor.
The One-Drink Glow
Here is an odd one. Photographs taken of people after a single low dose of alcohol, roughly equivalent to one large glass of wine, were rated as more attractive than photos of the same people sober. But photographs taken after a higher dose were not rated any better than sober photos.30PubMed Central. Increased Facial Attractiveness Following Moderate, but not High, Alcohol Consumption The researchers speculated that the effect comes from slight facial flushing, muscle relaxation, and a subtle shift in expression. The sweet spot is genuinely narrow: one drink produced a detectable improvement, but two or more erased it entirely. This is not an endorsement of drinking as a beauty strategy. But if you happen to be heading to a social event and are deciding between zero and one, the science suggests one glass may actually change how your face looks to others, however briefly.
Your Hair Speaks Volumes
Even subtle changes in hair properties affect how people are perceived. Research using digitally rendered hair manipulations showed that variations in hair diameter, density, and style all shifted perceptions of age, health, and attractiveness, sometimes in ways participants could not consciously identify.31Frontiers in Psychology. Age, Health and Attractiveness Perception of Virtual (Rendered) Human Hair For men, the news is less cheerful: reduced cranial hair was consistently associated with lower attractiveness ratings, though it came with increased perceptions of social maturity.32Ethology and Sociobiology. The evolutionary significance and social perception of male pattern baldness and facial hair The trade-off between looking attractive and looking mature is real, and some men may find the latter serves them better in professional or authoritative contexts even if it costs a few points in raw attractiveness ratings. For anyone with a full head of hair, the evidence suggests that keeping it healthy, thick-looking, and well-maintained is not just cosmetic vanity; it is read by others as a signal of youth and health.