Testosterone is an important hormone when it comes to health and fitness, and men who are on a Fasting journey may worry that testosterone levels will drop.
The good news is that, for most healthy adults, Fasting itself is not likely to have a major negative effect on testosterone levels. Let’s dive into that.
What does testosterone do?
Although testosterone is often thought of as a “male hormone,” both men and women produce it. Men simply make larger amounts.
Testosterone contributes to a healthy sex drive, but it does more than that. It helps maintain muscle mass, supports bone strength, and plays a role in mood and energy, as well.
Healthy testosterone levels are influenced by many factors, including age, body weight, sleep, exercise, stress levels, and nutrition.
Symptoms of low testosterone
Some of the more common symptoms of low testosterone include:
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Reduced libido
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Erectile dysfunction
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Fatigue
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Loss of muscle mass
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Unexplained weight gain
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Mood changes
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Reduced body or facial hair
Does Fasting lower testosterone?
Current research suggests that Fasting does not significantly reduce testosterone levels in healthy men.
During a Fast, your body temporarily shifts several hormones to help you adapt. Growth hormone increases, insulin levels fall, and your body becomes better at using stored fat for energy. Testosterone may fluctuate slightly, but these short-term changes are usually temporary and remain within the normal range.
It’s also important to remember that testosterone naturally changes throughout the day. Levels are typically higher in the morning and gradually decline as the day goes on. A single blood test doesn’t always tell the whole story.
In other words, temporary hormone fluctuations during Fasting are normal and don’t necessarily indicate a problem.
When can testosterone decrease?
While Fasting itself is not usually the cause, long-term energy deficiency can affect hormones, including testosterone.
Eating too few calories for an extended period, becoming extremely lean, overtraining without enough recovery, or consistently getting poor sleep can all contribute to lower testosterone levels.
But isn’t Fasting calorie restriction?
No, it’s not the same thing at all. Eating no calories is not the same as eating a few calories. When you’re eating, whether it’s 3,000 calories or 500 calories, insulin is triggered, and that’s a very different metabolic state than the fasted state.
That being said, it’s important that you eat enough nutritious food during eating windows. You want to fuel your body with the protein, healthy fats, vitamins, and minerals needed to support your body’s normal hormone production. Your eating window is just as important as your Fast.
If you’re practicing Extended Fasting, always take breaks between longer Fasts to properly nourish your body.
Can fasting actually improve testosterone?
For people who are overweight or obese, Fasting may indirectly support healthier testosterone levels.
Excess body fat is associated with lower testosterone in many men. Losing weight, and reducing inflammation can help create a healthier hormonal environment.
That doesn’t mean Fasting directly boosts testosterone. Instead, Fasting may help improve some of the underlying factors that contribute to low testosterone.
Please note that if you’re experiencing symptoms such as persistent fatigue, low libido, loss of muscle mass, or other signs of low testosterone, it’s important to speak to your healthcare provider, rather than assuming Fasting is the cause.
Fasting is just one piece of the puzzle
For most healthy adults, Fasting is unlikely to significantly lower testosterone levels. Temporary hormone changes during a Fast are a normal part of the body’s adaptation and are not the same as long-term deficiency.
The bigger concerns are chronic under-eating, poor nutrition, inadequate sleep, and excessive stress, all of which can negatively affect testosterone, whether you Fast or not. Healthy hormones depend on taking care of your whole body, not simply on when you eat or don’t eat.
