Caffeine has been shown to increase one’s fat-burning potential reasonably significantly when taken in doses of four to six mg per kilo of bodyweight. A good jumping-off point would be around 200mg to 400mg (on the lower end if you’re lighter, and the upper end if you’re heavier). Caffeine reduces fat by increasing metabolic processes and stimulating the central nervous system.
Caffeine also has positive effects in reducing the risk of Alzheimer’s disease, cirrhosis and liver cancer.
Warnings
Just note that if you’re generally a high-stress person then caffeine may exacerbate it, and may leave you feeling even more hyped up and tense than usual. You may also struggle to sleep if you take the caffeine too late in the day.