they are very skinny
it means you have a high metabolisim
People with a fast or high metabolisim are typically skinny.
metabolisim
the creation of energy
From the food we eat.
Metabolisim
metabolisim
Automobiles don't have a metabolism, they're not alive. They do need energy to move, though.
There are multiple reasons. They don't eat proper rations. They have a high metabolisim. They exercise often. They exercise too much. A sickness or ailment that makes weight gain difficult. There are plenty more causes, but this was only naming a few.
Fast metabolisim/thick fur/large fat stores
Yes. It slows down your metabolisim and, when you eat a full meal, it would make you gain more weight. That is why people who have a steady diet lose more weight