I had no trouble losing weight in my teens and twenties. I basically had to drink more water, reduce calories, introduce regular exercise like running. It got harder to lose weight as I got older. Even with learning about fat gram and carb reduction, in my mid thirties, I could no longer lose weight on my own. So I looked for help and successfully found it with Nutrisystem. When I needed to lose weight in my 40's, I tried Nutrisystem again. This time, it didn't work. My ezinearticles.com article tells you what Nutrisystem and Jenny Craig leave out.