PROTEIN for WEIGHT LOSS

  There are several biological mechanism's by which protein can help you lose weight.
These include
1. decreasing the effect of your hunger hormone (ghrelin)
2. increasing the number of calories burned through the digestive process (thermic effect of food)
3. helping you maintain muscle mass, which will improve your metabolism.
4. decreasing your cravings and late night snacking (the attached article has some interesting study results)

http://authoritynutrition.com/how-protein-can-help-you-lose-weight/

If you are trying to lose weight 30-40% of your total calories should come from protein.
For overall good health and longevity 10-20% is generally ideal.

best of health,
emmett