A good dose of vitamin C is important to increase platelet count. You can have orange juice, carrot juice, cauliflower soup, pumpkin soup, pineapple juice, stir-fried broccoli with bell peppers and tomato salad. In order to have protein, vitamin K and iron, eat plain dal, roasted peanuts, green leafy vegetables and pumpkin seeds.
Foods rich in vitamin B-12 can also help in dealing with low platelets. You can have eggs in small quantities to increase the count, but make sure you consult the doctor once.