Hello: There are two reasons for being thin: simple emaciation and secondary emaciation.

1: Simple emaciation has no definite endocrine disease and can be changed by bodybuilding (very effective).

2. Secondary emaciation is caused by organic pathological changes in nervous system or endocrine system. If it is secondary emaciation, please do bodybuilding after recovery.

There are also bodybuilders who eat less salt a few weeks before the game in order to reduce water in their bodies.

So as to lose weight and make muscles look "dry". For example, take part in the 70 kg class competition, 2 weeks before the competition.

The weight is still above a few kilograms. At this time, water and salt should be controlled.