No matter how disciplined, everyone gets food cravings once in a while. In one study conducted, 91% of women get a strong food craving that is hard to ignore-and these cravings are almost all the time for foods that are not good for you. These cravings are caused by dopamine, which is a chemical released by the brain that produces a “feel good” sensation.

Caffeine is a naturally occurring substance found in some parts of certain plants and is the most potent chemical found in coffee or tea. In its purest form, it looks like a crystallized white powder.