Testosterone can obviously promote muscle growth. For some bodybuilding athletes and some muscular men we often see abroad, they often take steroids to maintain a high testosterone level in their bodies. Although this once won them flowers and applause, the consequences will be endless as they get older. After stopping steroids, their muscles will be severely reduced and even affect their health. For those of us who aim at fitness and shaping, there is no need to do so. Only through normal diet and reasonable fitness methods can testosterone be controlled within a reasonable range and the purpose of muscle gain can be achieved. Here are a few phenomena that will affect the secretion of testosterone, so that everyone can avoid it. 1, too much stress will reduce testosterone levels. The nervous system can regulate the secretion level of almost all hormones. Studies have shown that when the stress is too high, the testosterone level in the body is obviously low. 2. Overtraining can inhibit the secretion of testosterone. Although intensive strength training can promote the secretion of testosterone in the body, it is a repair mechanism of muscle fiber damage. However, overtraining is not a good phenomenon. It can not only inhibit the secretion of testosterone, but also lead to the secretion of adrenal hormones, so as to decompose muscle protein and provide energy. 3. Hunger, lack of sleep and overwork can also inhibit the secretion of testosterone. 4. Low-fat diet will inhibit the secretion of testosterone. Meat food contains a lot of fat. Studies show that if you eat too little meat food, your testosterone level will decline. In order to avoid the low testosterone level affecting the fitness effect, you should avoid the above things, otherwise you really have to bid farewell to muscle growth.