@shredded_sages's testosterone claims, fact-checked

What did @shredded_sages actually say?

The creator listed six habits they claim are suppressing testosterone through two mechanisms: raising cortisol and raising estrogen. The six culprits were bad sleep, alcohol, morning coffee, non-organic produce, poor gut health, and what they called "bad fats" like peanut butter and avocado oil. The framing was confident and specific, including the claim that you need "three hours of REM sleep" nightly and that you must wait two hours before your first cup of coffee.

Some of these claims have legitimate science behind them. Others are distorted versions of real research. And at least one, the glyphosate-as-estrogen claim, is poorly supported and functionally unverifiable for the average person buying groceries.

Does the science back this up?

Partially, but the creator oversimplifies in ways that matter. Sleep deprivation does suppress testosterone, alcohol does interfere with hormone metabolism, and chronic stress does suppress the HPG axis. Those parts are grounded in real physiology. The specifics, however, are where things fall apart.

On sleep: the claim that you need exactly "three hours of REM sleep" is not supported by sleep science. Leproult and Van Cauter (2011, JAMA) found that restricting sleep to five hours for one week reduced testosterone by 10-15% in young men, but the mechanism involves total sleep quality and duration, not REM hours specifically. REM typically comprises 20-25% of total sleep, so three hours of REM would require roughly 12-15 hours of total sleep, which is not a realistic or evidence-based target.

On coffee: the two-hour delay idea is based on real cortisol research, specifically work by Lovallo et al. (2005, Psychosomatic Medicine), but the effect is modest and context-dependent. Habitual coffee drinkers show attenuated cortisol responses. Calling morning coffee a testosterone killer overstates a subtle, transient hormonal fluctuation.

What did they get wrong (or right)?

The alcohol claim is actually solid. Alcohol inhibits the hypothalamic-pituitary-gonadal axis, increases aromatization of testosterone to estrogen, and directly suppresses Leydig cell function. Emanuele et al. (2001, Alcohol Research and Health) documented this mechanism clearly. Credit where it is due.

The glyphosate claim is where the video goes off the rails. The creator says non-organic produce is "loaded with a chemical called glyphosate, which is very estrogenic." The estrogenic classification comes from in vitro and some animal studies, but regulatory bodies including the EPA and EFSA have not classified glyphosate as an endocrine disruptor in humans at dietary exposure levels. Telling people to only eat organic or "clean 15" based on this framing is fear-based, not evidence-based.

The "bad fats" segment is the weakest. Peanut butter and avocado oil are broadly considered beneficial in dietary research. The claim that these disrupt gut health and raise estrogen has no credible mechanistic support. Avocado oil is predominantly monounsaturated fat, which is not associated with inflammation or estrogenic activity in the literature.

What should you actually know?

If your testosterone is genuinely low, the causes are more complex than this list suggests. Clinically confirmed hypogonadism involves testing total and free testosterone, LH, FSH, and SHBG, not just eliminating peanut butter. Lifestyle factors do influence hormone levels, but the effect sizes are generally modest for men without underlying conditions.

Sleep is the most actionable item here. The research on sleep and testosterone is consistent and strong. Prioritizing 7-9 hours of quality sleep is genuinely useful. Alcohol reduction is also evidence-backed. Beyond that, the specificity the creator implies, exact REM hours, a two-hour coffee delay, organic-only produce, eliminating avocado oil, is not supported by clinical evidence at the level being claimed.

If you are experiencing symptoms of low testosterone, fatigue, low libido, mood changes, or reduced muscle mass, that warrants a blood panel and a conversation with a clinician, not a grocery list based on a TikTok video.