Chronic stress raises cortisol—a hormone that counteracts testosterone. Unlike testosterone replacement therapy (TRT), there are no injections, long-term shutdown of natural production, or expensive prescriptions. It’s not just about when you fast—it’s about how you eat when you’re not fasting. This creates a metabolic environment favorable to testosterone production.
Less free testosterone would suggest that more testosterone is bound by carriers, but surprisingly, no subsequent increases in SHBG were observed . After 4 weeks of 8 h TRE alone, circulating concentrations of SHBG remained unchanged, but free testosterone was reduced . In each trial, fat-free mass remained unchanged, while fat mass was reduced 8,10,11,12.
In other studies, it was found that in people with testes smaller than 14 mL, blood testosterone levels were below the physiological range . These variables are under control of testosterone, FSH and LH, whose blood levels in our subjects were within the physiological range before and after the fasting intervention 50,51,80,81,82,83. The longest period of fasting previously used by one of the participants was 42 days, while the shortest was 3 days. Before this study all the participants practiced water-only fasting of various duration. Fourteen healthy men (35–60 years old) who used to practice fasting before enrolling in this study were volunteers taking part in the present investigation. In general, the beneficial effects of mineral water consumption on changes in blood pressure 27,28, plasma lipid profile 29,30, propensity to lower insulin levels in blood after meal 30,31 and prevention of undesirable weight gain has been documented.
That gave me a simple, real-life look at what actually happens to testosterone during extended fasting and how fast it rebounds once you start eating again. I tested my testosterone before my fasts, at the end of a 9-day and a 10-day water fast, and again after refeeding. Overall, combining fasting and exercise led to a metabolic shift from carbohydrates to fatty acids and hormonal adaptations to stress. While exercise enhanced the effects of fasting on triglycerides, insulin, GH, TAS, PerOX, and IL-6, changes in total protein and lactate were solely due to exercise.
Some men may find that these benefits may create a more favorable environment for testosterone, while others may run into roadblocks. If you already struggle with low T, relying on fasting alone is unlikely to correct the problem. If you’re curious about fasting but still have questions, it’s best to consult a doctor first about the pros and cons. Fasting should be a tool to better your health, not a punishment on your body. For instance, athletes, men with thyroid issues, or those managing chronic conditions (such as diabetes) may struggle with fasting.
Li et al. showed that concentrations of SHBG significantly increased, with 2% weight loss after 5 weeks of 8 h TRE in females with PCOS. Three trials 9,13,14 examined how fasting impacts circulating concentrations of SHBG in females (Table 1). Thus, the bioavailability of these reproductive hormones is influenced by circulating levels of SHBG . In these trials 9,13,14, changes in androgen markers were also accompanied by reductions in body weight, inflammation, and insulin resistance, further illustrating the link between hyperandrogenism and metabolic disturbances. The FAI is a ratio that is calculated by dividing total testosterone by sex hormone-binding globulin (SHBG) and then multiplying by 100. Taken together, shifting calorie intake to earlier in the day may be preferred for females with PCOS to avoid further increases in estrogen levels.
Several studies back the link between fasting and testosterone. The best sexologist in India explains that the overall effects of fasting depend on duration, frequency, and individual health factors. In this article, we will look at how fasting affects testosterone production. According to the best sexologist in Delhi, maintaining optimal testosterone levels is essential for both sexual health and overall well-being.

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