I understand the theory, but I dont know a single person that has lost a significant amount of weight without vigorous exercise. Wish I could convince my wife. She needs to lose about 50 pounds and eats almost nothing... but I cant get her to so much as walk the dog around the block.
Muscle mass.
If a person doesn’t have a lot of muscle mass in relation to their weight, they don’t necessarily have to eat a lot and gain weight. Fat self-maintains. You don’t need necessarily a lot of calories to maintain a heavy weight, if you’re not exercising.
Is she tired or get tired very easily?
Does she not like being outside?
Does she not want anybody to see her?