A very high-fat, very low-carbohydrate ketogenic diet did not affect total testosterone and increased it significantly compared to a Western diet, while also increasing insulin in the Western group.

“you can see here that it did not affect the total testosterone in fact it increased total testosterone increased significantly on the very low carb ketogenic diet as compared to the western diet and interestingly insulin was increased significantly in the western group compared to the very low carb ketogenic diet”