INTERMITTENT FASTING HAS become one of the most talked-about nutrition strategies of the past decade. Depending on who you ask, it’s either a simple way to lose weight and improve metabolic health, or a miserable excuse to spend half the morning thinking about lunch. Either way, the popularity isn’t hard to understand.
Unlike many wellness trends, intermittent fasting doesn’t require expensive powders, complicated meal plans or a complete overhaul of your lifestyle. You simply spend longer periods without eating. However, each window triggers a chain of hormonal responses that help your body adapt to fasting. Those changes affect your weight, mood, energy levels and libido.
What Happens to Your Hormones During Intermittent Fasting?
Contrary to what your stomach might be telling you at 11 AM, your body is surprisingly good at handling a few hours without food. When you go for an extended period without eating, it needs to make hormonal adjustments to help you get through it.
One of the first things to change is insulin. As insulin levels fall, your body becomes better at accessing stored fat for energy and not relying solely on what you just ate. That’s one reason intermittent fasting is such a popular weight loss strategy, and it works. Following a 15 to 16-hour fast three days a week for three months has been proven to help people shed 4.02% of body weight.
Fasting also increases your levels of human growth hormone. Despite the name, it’s a natural hormone that helps regulate metabolism, supports muscle maintenance and encourages your body to use stored fat as fuel.
Of course, your body isn’t entirely focused on helping you fit into an old pair of jeans. Fasting can also increase cortisol, which is better known as the stress hormone. Before it alarms you, a temporary rise is completely normal. Your body treats a lack of food as a challenge and releases cortisol to help mobilise energy.
So, What Does This Have to Do With Sex?
Quite a lot, actually. Many of the hormones involved in metabolism and energy also affect sexual health. That’s why the eating pattern can give one man a boost in the bedroom and leave another wondering where his sex drive went.
Intermittent Fasting Could Give Your Sex Drive a Boost
A lot of men experience a boost in their sex drive when they fast. Part of that may come down to what’s happening in the brain. During a fast, levels of tryptophan — an amino acid used to produce serotonin — can decrease. That means less serotonin may be available as well.
Now, serotonin has a bit of a complicated relationship with sex. While it’s well-known to help regulate mood and well-being, higher levels can also suppress sexual desire. That means lower levels may have the opposite effect.
Weight loss itself can improve your sex life. Excess body fat is linked to lower testosterone levels, and testosterone is one of the main drivers of male sexual desire. If fasting helps you lose weight, those hormone levels may improve along with it, which can translate into a healthier sex drive.
The Same Diet Could Lower Testosterone in Some Men
Before intermittent fasting gets crowned the unofficial wingman of the wellness world, there’s another side of the story. For some young, physically active men, this eating strategy can reduce testosterone levels. Interestingly, it doesn’t seem to have a major influence on muscle mass or strength, but it could affect your libido.
There’s also a point where fasting can become too much of a good thing. If you’re stretching fasting windows too far, not eating enough, or combining it with intense training and poor recovery, your body may move into conservation mode. This pushes testosterone levels down and drives cortisol levels up. When your body is focused on conserving energy and managing stress, sex drive tends to move down the priority list.
Finding Your Sweet Spot
The hormonal changes that fasting triggers can support weight loss, improve metabolic health and benefit libido in some cases. Push things too far, however, and those same changes can start working against you. If you decide to give intermittent fasting a go, pay attention to how you feel, make sure you’re eating enough during your eating window and don’t ignore signs that something isn’t working.
