Not illegal. According to the Law of People's Republic of China (PRC) on the Protection of Consumer Rights and Interests, consumers have the right to make their own choices. As a commodity and service of merchants and consumers, weight loss service can set reasonable price and service period according to market rules, so it is not illegal to stipulate that weight loss service is valid for one year. Losing weight refers to a way to make the body thinner, which can remove excess fat in the body. Usually lack of exercise, overeating will lead to a little fat, especially bloated, you can choose to lose weight.