"Calorie restriction" refers to consuming fewer calories than usual in order to limit the amount of energy intake. It is a practice often done to promote better health and potentially extend lifespan. Full definition
There may be some health benefits to intermittent fasting, but there are also some serious risks to using severe calorie restriction as the only way to lose weight. (healthline.com)
Increasing physical activity in cats by 10 min of daily play produced as much weight loss as calorie restriction (41). (academic.oup.com)
However, while 14 weeks of calorie restriction did not significantly affect the middle - aged rats, it reduced muscle mass in the young rats. (sciencedaily.com)