I am always lethargic and tired because I work 11+hrs a day. On this diet, I had so much more energy than I expected and I was not hungry/starving or tired/lethargic at all. I was so shocked! You’re not allowed to work out and that was not a problem for me at all. However, when we had all that snow, I helped shovel a neighbor out, and overexerted myself because I was shoveling for over an hour. You have enough energy to get through your day, however long it may be, and then some. But no working out and seeing the pounds disappear daily is great! I’ve lost 4inches around my waist in 6 weeks.