Same weight, different burn: why your numbers are yours
You and your friend can weigh the same and still burn different calories. Muscle, daily movement, age and your body's own wiring set your number, so you should never copy a friend's deficit.
You and your friend both weigh 70 kilos. You eat the same dal and roti. She drops weight fast. You stay stuck. You think your body is broken. It is not. Two people can weigh the same and still burn different calories. Here is why, and why it is good news.
If two people weigh the same, they burn the same calories.
mostly falsemostly false
Weight is just one number on the scale. It does not show what that weight is made of. Muscle burns more calories than fat, even when you sit still. So a muscular 70-kilo body burns more than a softer 70-kilo body. Men often carry more muscle than women of the same weight, so they burn more. As we grow older we lose muscle, so we burn less. And people differ a lot. In one study, people were overfed the same extra 1000 calories a day. Fat gain still varied tenfold. The body is not a fair machine. It is your own.
Your daily burn is built from three parts
Your day's burn is not one magic number. It has three parts. The biggest part is your BMR (say bee-em-ar). This is the energy you burn just to stay alive, lying still. The second part is digesting food. About 10% of the calories you eat are spent breaking down the food itself. The third part is movement, and this is the part you can change most. Small daily movement has a science name: NEAT (nonexercise activity thermogenesis). It can range from about 100 to 800 calories a day. That huge range is one big reason two same-weight people burn different amounts.
What makes two same-weight bodies burn differently
Use YOUR numbers, not your friend's
The bottom line
Two people can step on the same scale and burn very different calories. Muscle, daily movement, age, sex and your built-in wiring all change the number. One study found the movers burned about 350 kcal a day more than the sitters, just from daily life. That is like one extra snack, gone, only because of how much they moved. So do not copy your friend's numbers. Find your own with Burnie, watch your own seven-day trend, and let your body do its own maths.