Yo-yo dieting is not good for your body and can be harmful to your bones. This is not a post against dieting, many of us should do more of it. This is for those who choose to diet, lose a lot of weight and then gain it and more back, diet again and repeat the process over and over. Here is a warning for those who yo-yo diet.
When you take off pounds, especially a lot of them, you lose muscle mass along with the fat tissue. The less muscle you have, the weaker your bones will ultimately become. When you yo-yo diet, you have less time to rebuild muscle and may be setting your bones up for problems later.