Photo: Lecic/istock

5 of 6

Dark greens are one of the best sources of folate, says Somer, a vitamin that's critical for brain functioning and protection. Considering many young women don't get the recommended 400 mcg per day, says Somer, you may feel like you're lagging during the day. Eat the right amount so you can feel at your best and on top of your game. The greens also contain iron, something women who get their period tend to lack, which affects your energy levels. Spinach also contains vitamin C to help boost your body's absorption of iron. Collards, baby lettuces and Swiss chard all count, too. As long as it's dark green, it's a win.