/r/dnp is a mitochrondria uncoupler. Basically the energy from food, has a reduced ability to reaches the muscles and fat cells, because it is lost as heat .

In high doses it is extremely dangerous and will cause death from hyperthermia. In low doses, the heat will be beneficial to weight loss and this action will mimic the energy lost from kenetic energy during exercise. 100mg is barely noticable.

In very basic terms, it makes your cells lose energy as heat. Like turning on the heater in your car to waste petrol.

For every 100mg consumed, the metabolic rate is increased by approximately 15% - turning a sedimentary daily requirement of 2000 calories a day in to 2300 a day.

100mg is barely noticable, the recommended dosage to not exceed 500mg, which will produce all day sweat equivilent to jogging. Beyond that it can have lethal consequences, people have needed to stay under AC and cold baths all day. Any physical activity becomes 70% more difficult. Walking up the stairs will be difficult.

If you imagine a 70% increase in metabolic rate at a tdee of 2000, a user would burn 14000 x 1.7 = 23800, 23800-14000 = 9800, 9800/3500 = 2.8, a weight loss of 2.8lbs without exercise in one week.

Now if you factor in an athlete dieting on 1600 calories and having a TDEE of 3000 including exercise, you can get an idea of how that would rapidly increase weight loss. 3000 becomes 5100 calories burnt in a day, with only 1600 replenished, resulting in a net loss of 3500 calories / 1lb of fat per day, of 7lbs per week.

Without the drug, they would have only been able to acheive 1400 a day, of 2.8lbs per week, or 0.4lbs per day, despite following the same exercise and diet. As you can see this has almost trippled their fat loss results and shortened the time required.

In 2 week, the dedicated person could lose upwards 10-14lbs of fat, enough to drop a weight class especially as the person is likely to be lean to begin with.

Obviously this is an extremely dangerous drug with no deminishing returns on the dosage, making it extremely dangerous and not to be fucked with if you don't know what you're doing. Most people will never need to use it to lose weight unless they are already exceptionally lean.

It has other benefits too, like improving appetite regulation and insulin sensitivity.