Do protein bars with sucralose affect sperm quality in young men?
Likely yes with daily intake. Sucralose acts on the same FGFR1 pathway tied to lower sperm quality in animal studies.
What's actually in it
Most protein bars marketed to gym-goers swap real sugar for sucralose, aspartame, or acesulfame K. The bars taste sweet without the carb load. Daily eaters often hit a few bars worth of sweetener per day, plus diet sodas and sugar-free yogurts on top. Young men in this routine can rack up a steady intake.
What the research says
A 2026 study in Reprod Toxicol mapped how artificial sweeteners interact with male reproductive tissue. The team flagged FGFR1 signaling as a key target. Animals fed human-relevant sweetener doses showed real drops in sperm quality. Sucralose was a top hitter.
Trying to conceive? Pull sucralose, aspartame, and acesulfame K out of the daily routine for three to six months. Pick bars sweetened with dates, monk fruit, or stevia leaf instead. Examples include RXBAR, Larabar, and IQBAR. Plain water or sparkling water swaps for diet soda fast.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Artificial sweeteners and male infertility: Network toxicology and experimental evidence reveal FGFR1 as the critical target | Reprod Toxicol | 2026 |
What to use instead
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