A Complete Guide to Intermittent Fasting Intermittent fasting (IF) is a dietary strategy that alternates between eating and fasting intervals. Intermittent fasting places mrelax gaming slots listore emphasis on when to eat than on what to eat, in contrast to traditional diets. This approach has grown in popularity recently due to its effects on general health as well as its possible advantages for weight loss. Since many cultures have traditionally included fasting in their religious and spiritual rites, the idea has ancient roots.