As the chilly weather brings with it a surge in colds and flu -like illnesses, it's crucial to remember that your diet can play a significant role in your recovery. When you're feeling poorly, you might not feel like eating much, but giving your body the right nutrients can help it fight off the viruses that are making you feel under the weather. We all know that fruit and vegetables are good for us, with the recommended five-a-day, but some can actually do more harm than good when you're ill.