The amount of fat consumed in the diet is associated with changes in testosterone levels in the blood, with higher intake between 50 and 150 grams per day linked to higher levels.

When overweight men eat a very low calorie diet for 12 weeks, their testosterone levels go up a lot, which can help improve their health.

Low-carbohydrate, high-fat diets are associated with higher basal testosterone levels compared to high-carbohydrate diets in healthy adults.

The more testosterone you have in your blood, the stronger both the good and bad effects on your body become — like a volume knob turning up both the benefits and the side effects at the same time.

If young men eat much less and exercise a lot for four weeks while taking a high dose of testosterone, they gain a few extra kilograms of muscle compared to those taking a fake pill—even though their strength and leg function don’t get better.

Eating only animal foods with lots of fat might keep a man's testosterone levels high, even if he's eating less or is already lean.