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The high levels of hormones will give you a better appetite, and you might have cravings for some type of food; just continue to eat sensibly, and to make sure that your diet includes a good source of iron, such as spinach. You should also make sure that you stay well hydrated because of the blood loss. Lots of fresh veggies, and if you aren't vegetarian, a little red meat will help to get your iron levels back up. If you have anaemia as a result of the period, you may also need an iron supplement, as some people don't absorb iron that's contained in food!