I have a friend that is exactly like that. I know she eats a ton because I've vacationed with her She did "try" eating low carb for awhile but she reacted differently. She ended up gaining weight and inches. Also, she felt really lethagic. Granted the decrease in energy in the beginning is normal. I know that there are a number of different low carb plans. She might benefit from another plan than Atkins. We were actually looking into that for my friend.