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At Gameday, we provide comprehensive testosterone testing and therapy services so you can understand your hormone levels before making major lifestyle changes. Intermittent fasting can help some men shed fat and improve overall metabolic health, which may indirectly support testosterone. (5) Better insulin function helps stabilize hormones and may prevent the dips in testosterone commonly seen with obesity and type 2 diabetes. Excess fat, particularly visceral fat around the abdomen, can substantially reduce testosterone levels. Intermittent fasting does not directly raise testosterone in the same way that testosterone replacement therapy (TRT) does, but it may create conditions that support healthier hormone balance. Approximately 80 percent of those in the time-restricted eating group reported plans to continue the regimen after the study concluded. Notably, it reduced the free androgen index—a key indicator of how much active testosterone is circulating in the body—suggesting a more meaningful improvement in hormonal balance.
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In addition, two studies 9,14 examined the effects of fasting on androgens in women with PCOS. Three studies 9,13,14 have examined the effect of intermittent fasting on androgen markers in females (Table 1). The FAI is a ratio that is calculated by dividing total testosterone by sex hormone-binding globulin (SHBG) and then multiplying by 100. Studies have reported that hyperandrogenism promotes insulin resistance and visceral adiposity among females by decreasing whole-body glucose uptake 22,23. Taken together, shifting calorie intake to earlier in the day may be preferred for females with PCOS to avoid further increases in estrogen levels. To date, only one trial has measured the effect of meal timing on estradiol levels in women (Table 1). Women with overweight and obesity have higher levels of estrogens relative to their normal-weight counterparts .
When men with elevated body fat practice intermittent fasting, they often experience improvements in testosterone as they lose fat and reduce this hormonal conversion. Excess body fat — particularly visceral fat around your organs — actively works against healthy testosterone levels. If your testosterone levels and body weight are within a normal range, fasting may not be needed or beneficial. However, intermittent fasting that causes weight loss may support long-term testosterone production in the overweight population. 1.) In non-obese men, an intermittent fasting testosterone study showed that fasting increased LH (luteinizing hormone – a testosterone precursor hormone) up to 67% and overall testosterone 180%. In recent years, more men have turned to intermittent fasting as a strategy not just for weight loss, but to enhance hormone production and vitality.
This study’s longer duration and focus on a different study population (obese males) may explain why the findings differ compared to the 2022 research, the authors point out. It’s an example of an issue that’s not clear-cut and comes with both risks and benefits.The research was also on lean, healthy, active men. During a feeding window, you eat all of your meals for the day.
An increase in estrogens derived from excess adiposity is linked to adverse health outcomes such as polycystic ovarian syndrome (PCOS), anovulation, and increased breast cancer risk 17,18,19. It is the main female reproductive hormone and is involved in the development and maintenance of female reproductive tissues and the regulation of the menstrual cycle . After 8 weeks of intervention, reductions in free and total testosterone concentrations were observed. These concerns come from a study by Moro et al. , where young lean males participated in an 8 h TRE intervention (all food consumed between 12 to 8 p.m.) combined with resistance training. Intermittent fasting is not recommended for children under the age of 12, since it has the potential to negatively impact puberty and growth . These concerns largely stem from the findings of one rodent study by Kumar et al. . ADF involves a "feast day", where individuals eat ad libitum, alternated with a "fast day", where participants can choose to consume only water or consume ∼25% of energy needs.
Intermittent fasting is not a magic solution for hormonal acne, but for someone with the right hormonal profile, it can be a meaningful piece of the puzzle. Rather than guessing at what might help, the approach is built on testing, interpreting results in context, and creating a plan tailored to what is actually going on hormonally. The first phase focuses on actively rebalancing hormones with herbs and supplements. Focus on nutrient-dense foods, such as low-glycaemic options, adequate protein, healthy fats, and foods rich in zinc and vitamin A. A steak is only about 20% pure protein, so hitting that target means eating roughly 500 grams of meat in a day.
The body relies on protein to build the enzymes that drive hormone production, hormone detoxification, energy metabolism, and neurotransmitter synthesis. Clinical experience across thousands of patients suggests that most women who tried intermittent fasting did not find it successful. But the reality is that for plenty of women, fasting makes hormonal acne worse, not better. The positive hormonal research is largely concentrated in women with insulin resistance or PCOS. The strongest evidence for the benefits of intermittent fasting comes from studies on insulin sensitivity. Cortisol affects the production of other hormones throughout the entire system.
If done improperly or too aggressively, fasting may lower testosterone rather than support it. While fasting is popular and may have some health benefits, it’s not without risk. Fat tissue contains aromatase, an enzyme that converts testosterone into estrogen, lowering overall levels.

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