We get it: As soon as you feel like crap, you feel like eating more crap. But your body needs whole, nutrient-rich foods now more than ever.
Stay far away from sugar when you’re under the weather. “Eating excessive sugar in one sitting (>100g; equivalent to 20-oz cola and a candy bar) has shown to lower the immune system for at least two hours," says Lemond. "High-sugar foods have a tendency to be lower in nutrients as well."