It's rich in pectin, a soluble fibre that lowers blood cholesterol and reverses the negative effects anger has on the body.
Grapefruit also contains vitamin C, potassium, calcium and iron.
Reach for an apple. It contains lots of boron, which helps boost mental alertness. Grab a handful of raisins, rich in iron. Lean towards lentils, a good source of iron. Fill up on carrots, an excellent source of beta-carotene, which is not only famous for promoting healthy eyesight, but decelerates the aging process.