Research shows an unsteady diet may reduce lifespan

Recent research by Glasgow University may draw a connection between "crash dieting" (a term given to an unsteady diet with large fluctuations in daily food intake) and a lesser lifespan. During the research, scientists
"observed that fish given a "binge then diet" food regime had a reduced lifespan of up to 25%."
This ties in with the simple rule that dieting alone cannot be a substitute for exercise. A weight loss regime that does not include exercise can force us into abnormal eating patterns, such as a "binge then diet" pattern, while not doing much to help us lose weight. link