Does Sugar Lower Testosterone? What the Science Says

TL;DR — Key Takeaways

• Yes, sugar lowers testosterone, both short-term and long-term.
• In a 2013 study, a 75g glucose drink dropped testosterone ~25% for up to 2 hours.
• The bigger problem is chronic high sugar → insulin resistance, fat gain, inflammation → sustained suppression.
• It affects even young, healthy men, not just those with weight issues.
• Cutting excess sugar and losing fat can help restore testosterone.

Yes, sugar can lower testosterone, short- and long-term. In one study, a glucose drink dropped men’s testosterone ~25% for up to two hours via the insulin spike. Over time, high sugar drives insulin resistance, weight gain, and inflammation, all of which suppress testosterone, even in young men. Cutting excess sugar and losing fat helps restore it.

Unlike the soy myth, this one’s real: sugar genuinely lowers testosterone. Here’s how much, and why. (Part of our guide on what lowers testosterone; for the overview, our complete TRT guide.)

Does Sugar Lower Testosterone?

Yes and the evidence is fairly clear. Sugar hits testosterone on two timescales: an acute dip right after you eat it, and a chronic decline if high sugar intake becomes a daily habit. This is the opposite of the overblown soy fear, sugar is a real dietary culprit.

Key fact: In a 2013 study, a 75g glucose drink lowered testosterone ~25% for up to two hours and repeated daily, sugar drives insulin resistance and fat gain that suppress it long-term.

The Acute Effect: A Single Sugar Load

A 2013 study (Caronia et al. Clinical Endocrinology) gave 74 men a standard 75g glucose drink and measured testosterone over two hours:

• Testosterone dropped by about 25% on average.
• It stayed suppressed for up to 2 hours.
• The effect was seen regardless of BMI or glucose tolerance.

So even a single big sugar/glucose load causes a temporary testosterone dip, driven by the insulin spike.

The Bigger Problem: Chronic Sugar and Insulin Resistance

The acute dip alone isn’t the main worry. The real damage comes when that suppression happens multiple times a day, for months and years:

• Chronic high sugar → insulin resistance
• → Body fat accumulation (and fat converts testosterone to estrogen)
• → Inflammation and metabolic dysfunction

Together these produce a sustained drop in testosterone, the same fat/insulin cycle that makes excess body fat the #1 cause of low testosterone and ties into TRT and weight.

Does It Affect Young, Healthy Men Too?

Yes. The acute glucose effect showed up across ages and body types, and high sugar intake is linked to lower testosterone even in young men. So this isn’t only a “middle-aged, overweight” issue, sugary diets can drag down testosterone at any age.

Does Cutting Sugar Increase Testosterone?

Often, yes, indirectly and directly. Reducing sugar:

• Avoids the repeated acute dips.
• Improves insulin sensitivity and helps you lose fat, which raises testosterone.

It’s one of the simplest dietary levers, and part of the broader playbook in how to increase testosterone naturally. You don’t need zero sugar, just cut the excess (especially sugary drinks).

Conclusion

Does sugar lower testosterone? Yes, a single large glucose load dropped testosterone about 25% for up to two hours in one study, and chronic high sugar intake suppresses it further through insulin resistance, fat gain, and inflammation, even in young men. The fix is straightforward: cut excess sugar (especially sugary drinks), improve your diet, and lose excess fat. Your testosterone and overall health, will thank you.

For the full set of causes and fixes, see what lowers testosterone and how to increase testosterone naturally and explore everything on men’s testosterone health at TRT NYC.

👉 See how your diet affects your levels: check your testosterone with an at-home test kit and talk to a licensed provider if it’s low.

Frequently Asked Questions

Does sugar lower testosterone?

Yes. A 2013 study found a 75g glucose drink lowered men’s testosterone by about 25% for up to two hours. Beyond that acute dip, chronic high sugar intake suppresses testosterone through insulin resistance, weight gain, and inflammation, affecting even young, healthy men.

How does sugar lower testosterone?

Acutely, sugar spikes insulin, which temporarily lowers testosterone. Chronically, repeated sugar loads drive insulin resistance and body-fat accumulation, and fat converts testosterone to estrogen while inflammation further suppresses it. So sugar lowers testosterone both immediately and over time.

Does one sugary meal lower testosterone?

Temporarily, yes. Studies show a large glucose or sugar load can drop testosterone by roughly 25% for up to two hours. This acute dip recovers, so an occasional treat isn’t a lasting problem, the concern is frequent, daily high sugar intake.

Do sugary drinks lower testosterone?

Yes, sugary drinks are among the worst offenders because they deliver a fast, large sugar load and are easy to over-consume daily. High intake of sugary beverages is linked to lower testosterone, and cutting them is one of the easiest dietary wins.

Does cutting sugar increase testosterone?

Often, yes. Reducing sugar avoids repeated acute dips, improves insulin sensitivity, and helps you lose fat, all of which support higher testosterone. You don’t need to eliminate sugar entirely, just cut the excess, especially sugary drinks.

How much sugar is too much for testosterone?

There’s no exact threshold, but frequent large sugar loads and sugary drinks are the problem. Aim to limit added sugars, prioritize whole foods, and avoid regular sugary beverages. The goal is preventing the chronic insulin resistance and fat gain that suppress testosterone.

Written by: TRT NYC Editorial Team: Last updated: July 2026 · Reviewed against: peer-reviewed research and Endocrine Society guidance (see References).

Medical disclaimer: This article is for educational purposes only and is not medical advice. trtnyc.com is an independent informational resource, not a medical provider. Always consult a licensed healthcare provider about your testosterone.