Low testosterone TikTok claims: what the science actually says

What did @natalyatoryanski actually say?

The creator claims she can detect low testosterone in men by instinct, smell, and visual cues. She sets a testosterone threshold of "higher than a thousand" as her personal standard, warns against soy because she can "smell the phytoestrogens coursing through a man's bloodstream," and argues that eating saturated fat, butter, egg yolks, and steak produces a visible, almost spiritual quality she describes as "cholesterol energy." This is lifestyle content dressed up in hormone-panel language, and it deserves a harder look than it's getting from 32,800 viewers.

The video is not a medical explainer. It's a dating-preference post. But because it makes specific physiological claims, including that dietary cholesterol visibly "glistens" on skin and that soy raises estrogen to a detectable level, those claims should be held to an actual standard.

Does the science back this up?

Mostly no. The idea that you can smell or visually identify a man's testosterone level has no peer-reviewed support. The dietary claims are a mixed bag, some with a grain of truth buried under significant exaggeration.

On soy: the concern is phytoestrogens, specifically isoflavones like genistein and daidzein. The evidence here is weaker than the internet suggests. A systematic review by Hamilton-Reeves et al. (2010, Fertility and Sterility) found no significant effect of soy protein or isoflavone intake on testosterone, LH, or FSH in healthy men. A 2021 meta-analysis by Reed et al. in Reproductive Toxicology reached similar conclusions. Clinical gynecomastia from soy requires extremely high, unusual intake levels, not a glass of soy milk.

On dietary fat and testosterone: there is something here. A meta-analysis by Whittaker and Wu (2021, Journal of Steroid Biochemistry and Molecular Biology) found that low-fat diets were associated with modestly lower testosterone levels in men. Cholesterol is a precursor to steroid hormones, so the biology is real. But "cholesterol energy glisten" is not a thing. That is vibes, not endocrinology.

What did they get wrong (or right)?

Wrong: The claim that testosterone should be "higher than a thousand" as a universal standard ignores how testosterone reference ranges actually work. The normal range for total testosterone in adult men runs roughly 300 to 1000 ng/dL depending on the lab and assay. Many men function well, feel good, and have no symptoms of hypogonadism at 500 or 600 ng/dL. Setting 1000 ng/dL as a floor is not a clinical recommendation, it is a preference that has no grounding in endocrine guidelines from organizations like the American Urological Association or the Endocrine Society.

Wrong: You cannot smell phytoestrogens "coursing through a man's bloodstream." This is not how olfaction works. There is no published mechanism by which circulating isoflavone metabolites produce a detectable body odor signal.

Partially right: The connection between dietary fat intake and testosterone production is biologically plausible and supported by some data. Whittaker and Wu (2021) found a statistically significant association. It is real. It is also modest and does not produce anything visible on skin.

Wrong: The idea that cholesterol "transcends diet" and becomes a visible energetic quality is pseudoscience. It should be named as such plainly.

What should you actually know?

If you are a man concerned about testosterone, the single most useful step is getting a blood test, specifically total testosterone drawn in the morning when levels peak. Symptoms of low testosterone include fatigue, reduced libido, difficulty concentrating, and loss of muscle mass, not traits you can identify from across a room.

Dietary choices do play a supporting role in hormonal health. Severe caloric restriction, very low fat intake, heavy alcohol use, and obesity are all associated with lower testosterone levels in the literature. But no single food is a testosterone killer or a testosterone booster in any clinically meaningful sense for a healthy man eating a varied diet.

The Endocrine Society defines male hypogonadism as consistently low testosterone combined with symptoms. A number on a panel without symptoms is not a diagnosis. And a number above 1000 does not make you a superior partner, it makes the creator of this video happy, which is a different thing entirely.

If you have genuine concerns about your hormone levels, that conversation belongs with a licensed clinician, not a TikTok comment section.