In the third trimester, you can eat more foods rich in collagen, such as pig's trotters, which helps to increase skin elasticity. Eating more crucian carp, carp, radish, melon and other foods will help relieve edema symptoms. Eat more foods rich in unsaturated fatty acids such as walnuts, sesame seeds and peanuts, and foods rich in protein such as chicken and fish. Choose foods rich in vitamins and minerals such as celery and lettuce, and often eat some foods rich in iodine.