It can also be hard on the heart. But exercising and falling off is better than not exercising at all. Very little was mentioned in today's article on a proper diet to facilitate ab development and prevent saggy abs. Len, Diet is simple. Food is energy, if you don't use it in activity or exercise, it will be stored as fat.
Energy consumed is the amount of food or drink eaten.
Energy Expended equals breathing, heat beating, etc. and work and exercise performed by our muscles. If Energy consumed is less then energy expended we WILL lose weight. If energy consumed is greater than energy expended we will gain weight. Barb, I'm sorry that I don't have one or two books to recommend. I would pick books targeted at your demographic.