Is burning more calories then you have ate the key to weight loss? I am recently on a diet. I am 12 years old, and trying to loss weight. My mom doesn’t agree with me that burning more then you ate in one day is the key to successful weight loss! Is that true? What are some good...

I am starting a weight loss competition in my family, whats the best way to measure progress? I wanted to start a weight loss competition this summer in my family, but I wanted it to be fair. For example its probably easier for my 260 pound brother to lose a pound than my 160 pound mom. So whats is the best way to compare? Should it just be percentage of mass? Should fat be considered? Should i buy...