Do you burn more calories when you have a fever?
Yes. The maxim “Feed a cold, starve a fever” is not only wrong, it’s counterproductive. When you’re ill, you need as much nutrition as you normally do, and when you have a fever, you need even more. A higher temperature speeds up your metabolism. This results in extra calorie burn, and if unmatched by intake, it exacerbates the weakness you often feel when you’re sick. So it’s no surprise that you feel much better after you have something to eat. Fever is also dehydrating, which is one reason that drinking extra water is especially important when you’re not well.