Pineapple contains a compound called bromelain. The protein-digesting enzymes in it are thought to aid digestion. While not all studies agree on its effectiveness, bromelain is used worldwide as an anti-inflammatory, an anti-coagulant, and is thought to have anti-cancer properties.
Pineapple is an outstanding source of vitamin C, and the mineral manganese, both of which help protect against cell damage caused by free radicals. Manganese is also essential in producing several enzymes needed for energy
Since pineapple is a very sweet fruit, it's best to eat it in its natural form, rather than as a juice, because the soluble fibre it contains slows down the rate at which sugar is released as you digest it. Consumption of sweet juices causes spikes in blood sugar and insulin levels, which can encourage the body to produce and store fat.