The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
if you look across those six eligible interventional studies looking at high fat versus low-fat diets in men looking at men's sex hormones testosterone pre-testosterone dihydrotestosterone what you find is that there were significant decreases in sex hormones on low-fat versus high fat diets
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and so i just focused on the the cream of the crop like the intervention studies and we were very rigorous we like selected the best ones out there so they didn't have confounded variables like um the guys were on medication or they had diseases things like that and we we did the meta analysis about six studies we split one into two so it was like seven samples roughly 200 guys and the studies lastly they put men on a first on a high fat diet about 40 fat and then they put them on a low fat diet about 20 percent fat and some studied it vice versa and mixed it up but they found when the when the guys transferred from the high fat diet to the low fat diet their testosterone decreased by about 11.5 on average
low fat diets appear to decrease testosterone levels in men but further randomized controlled trials are needed to confirm this effect
you can see here that there were significant decreases in sex hormones on low-fat versus high-fat diets they went on to say that low-fat diets appear to decrease testosterone levels in men but further randomized controlled trials are needed to confirm this effect