Let’s start with ephedrine’s basic mechanism of action. Ephedrine is a sympathomimetic, which means it acts to increase sympathetic activity. Why is this important? Because there is a drop in sympathetic activity when you cut calories. When you get a drop in sympathetic activity you get a decrease in metabolic rate and lower rates of lipolysis (fat mobilization). This can play a significant role in why you plateau on long-term diets. The use of ephedrine and caffeine can stave off this drop in metabolic rate and allow fat loss to continue unabated for several additional weeks.
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