The Promise. Lose up to 10 pounds in 2 weeks -- and that's just the beginning of what the Mayo Clinic Diet says it can do for you. The Mayo Clinic Diet is the official diet developed by the Mayo Clinic in Minnesota.
1 18 calories in 1 cup of sliced green peppers (3.2 oz or 91g). 2  30 calories in 1 cup of chopped green peppers (5.3 oz or 149g). 3  24 calories in 1 average size green pepper.
Look for peppers that are firm to the touch and have no dark spots or obvious bruising. One sign of a pepper that is not fresh is when there are small pits in the skin. Green bell peppers have twice the amount of vitamin C as oranges and red or yellow bell peppers have 4 times as much. They are packed with antioxidants as well, including lycopene and carotene. The antioxidant levels are generally higher in red, yellow or orange than with green peppers.