A cup of muscle weighs more than a cup of fat. When you're starting to build muscle, it's easy to go through a period of not losing
weight because the fat weight is being replaced (and sometimes added to!) by muscle weight. But remember that fat does not equal weight, and gaining weight does not mean you're fatter.
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Does anyone know exactly how the weight training effects weightloss?
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Do you mean the process? Long story short - muscle needs calories. The more muscle mass you have, the more calories you will burn. This is why bodybuilders can eat thousands of calories a day and maintain insanely low body fat percentages. If you maintain a healthy or restricted caloris intake, and bulk up for muscle mass, you will burn (at rested state) more calories than before the muscle was added. Burning more calories than you're eating = breaking down fatty reserves to "fill in the gaps".
That's WAY simplified. :)