Of course, there are a number of foods and beverages that have a very low nutrient value, and an overindulgence in them has been closely linked to obesity, diabetes, and other chronic diseases. According to Saidel, these same foods can compromise your immune system and its ability to keep you healthy. Here are the top three she says to be mindful of to keep your immune system kicking. RELATED: Experts Say This Is How Much Wine You Should Be Drinking a Day for Optimal Health Additionally, there are plenty of wholesome, nourishing, and delicious frozen meal options on the market. When in doubt, look for products from Dr. Praeger’s or Daily Harvest.