My friend eats more than me and doesn't gain weight...

Your friend appears to be about the same size as you but why is it that she can eat more than you and still not gain weight???

It's very possible her body mass is higher!

Two women at 150 lbs.
Woman A is 20% body fat and 80% lean body mass
Woman B is 30% body fat and 70% lean body mass

Woman A is going to automatically have a higher metabolism and burn more calories daily than Woman B

Our body consumes calories while we sleep.  Our body is also cleansing itself and rejuvenating and it takes energy to do so. 

Lean body mass (muscle) works for you while body fat is just added weight to be carried around.

You might be surprised to find out what your lean body mass ratio is.  It's important to know and important to have lots of it!

Here are a few reasons...

• During illness the body uses its muscle mass for the extra protein needed for the immune system.  Burn victims can use up to 4 grams per pound of body weight (inbodyusa.com) trying to heal itself. (most people barely eat ".5" grams of protein per pound of body weight on a regular basis)
• Lean body mass (muscle) helps keep bones and joints strong as we age, hopefully helping to prevent osteoporosis.  You may think you have enough muscle for this but most do not have as much as they think.
  
• "for every 10% increase in skeletal muscle mass, there was an 11% decrease in insulin resistance".  Gaining more muscle mass can decrease your chance for type 2 diabetes. (inbodyusa.com)
• Increasing your lean body mass (muscle) can increase your BMR (basal metabolic rate) which means you're burning more calories while at rest.

Invest in your future!  Have your body composition analyzed and prepare yourself for a healthier you as you get older.