This is one reason why I think that carb cycling is good. You see eating enough protein, many carbs and many fats is the diet that is supposed to increase your testosterone and build muscle (combined with enough sleep). But such a diet is only possible when bulking. When cutting you need to either lower carbs or fats. Lowering carbs will make your workout performance suffer and lowering fats will make your testosterone levels suffer (maybe). So here is where carb cycling comes into play, when cutting. The days when you exercise you should follow high carbs and low fats but at the rest days – high fats low carbs. In general carb cycling is not necessary, but maybe it will help keep testosterone levels high while cutting.
Testosterone is a hormone that is produced in large amounts by males (and a little bit in females), in the testes and adrenal glands. High testosterone levels are associated with sexual performance, reproductive function, muscle mass, hair growth, aggressive, competitive behaviors, and other such manly things. Testosterone levels tend to peak at the age of 40, and slowly decline from there. Luckily, there are many things you can do to increase testosterone, so if you feel like your T levels could use a boost, you've come to the right place.