> One study showed that individuals on calorie restriction lost muscle mass and an average of 20 pounds of weight over the first year and maintained their weigh

> One study showed that individuals on calorie restriction lost muscle mass and an average of 20 pounds of weight over the first year and maintained their weight for the second year. However, despite losing muscle mass, calorie restriction participants did not lose muscle strength, indicating calorie restriction improved the amount of force generated by each unit of muscle mass, called muscle specific force. If people lost 20 lbs in the first year of a 12% calorie restricted diet then that means that this study took place among people who were already obese (which seems extremely relevant). Anyone who is in good shape and not 6'8 is in no position to lose 20 lbs without serious risks to their health, aside from vastly decreased muscle strength. It is interesting, but not very surprising, that obese people with atrophied muscles don't lose "strength" by cutting calories and losing some muscle mass, which is very low to begin with.