Krissi> Are you female? Women have 10-12% essential bodyfat and can't go below that and be healthy.
a reliable source that says there can be a substantial difference in the caloric value of food between different people?
Hence the post - http://www.thyroidmanager.org/Chapter5/5a-frame.htm
The quote I posted is in the linked article. Maybe if you actually read it, you would have noticed the second page. It wasn't exactly hidden...
And I say again - What you eat, how much and when, all affects hormone levels, which is what the study shows (and what the other posters are saying). BMR is not a fixed value. This means two people of the same mass can react quite differently to the same amount of calories from foods.
I know you can eat more calories (by raising fat) and lose more body fat, because I have done it. There are plenty of others here finding the same.
I also noticed you ignored the question:
krissi, have you read Good Calories, Bad Calories by Gary Taubes?
If you haven't, you should. It has a lot of the answers you seek.
The "Seven Deadly Sins"
• Grains (wheat/rice/oats etc) . . . . . • Dairy (milk/yogurt/butter/cheese etc) . . . . .• Nightshades (peppers/tomato/eggplant etc)
• Tubers (potato/arrowroot etc) . . . • Modernly palatable (cashews/olives etc) . . . • Refined foods (salt/sugars etc )
• Legumes (soy/beans/peas etc)