
1. Not taking a sick day when you need one
If you’ve gotten into the habit of refusing to take a sick day off when you need one, it could place a lot of unnecessary stress on your immune system. When you’re feeling unwell, exerting yourself in the same way that you would on any other day is a sure-fire way to weaken your immune system and unable to fight viruses like the flu, leading to more sick days being required in the future.
2. You don't eat enough (or any) carbs
According to Elizabeth Gardner, Ph.D., an associate professor in Food Science and Human Nutrition, “Originally we thought the calorie restriction would help improve their immune systems, but we found the opposite was true,” and that “more calories during flu season helped ward off the virus or if it didn’t, it at least resulted in fewer symptoms and a speedier recovery.”
