On a diet pill

I'm retiring from one of my jobs at the end of this month, and I'm looking forward to having more time to take care of myself, such as to watch what I eat (pretty hard when you only have time for fast food) and to exercise (pretty hard when you only have one or two weekend days, and rain has been falling consistently enough to ruin many of those. I may not take a diet pill, but I expect to lose weight that is pounds of fat, and to put on new muscle weight. I want to live a very long life, and in good health, so I'm active and enjoying life. I don't want to give up or quit.