Thank you for your enormously thoughtful and helpful response. I really appreciate it. I was hoping I could add a few more details and get advice on a specific plan. I'm 5'10, 160lbs, wanting to lose lose 20 lbs. A week ago, I got the "Lose It!" app which suggested I eat 1500 calories a we...

I want to lose 20 pounds of fat. I discovered recently, to amazement, that I can feel completely full just 600 calories a day. so I decided I would just consume 600 calories a day, plus weight training to maintain muscles. of course, this would mean I'm consuming very little protein. Will I be able ...