Causes of muscle flaccidity include lack of protein, obesity or gradual aging of the body, nutritional imbalance, and disuse muscle atrophy from lower limb braking or long-term bed rest. If the protein content of the human body is insufficient will appear muscle flaccidity, no elastic performance, if obese people or the body gradually aging, then the muscle will be more flaccid. Insufficient eating or unhealthy weight loss leading to nutritional imbalance, as well as the usual lack of exercise, can lead to subcutaneous fat loss causing muscle flaccidity.