This one will be the hardest for me since cheese, yogurt and the occasional half-and-half do make regular appearances in my diet. However, dairy can make insulin regulation difficult and it can help to cut it out for a couple weeks.

Eliminating dairy products can help with other problems as well. Cow's milk is the only food that is directly linked to acne. It can also be an inhibitor to weight loss, even in very small amounts. Like gluten, dairy can also trigger inappropriate immune responses, making it particularly problematic for people with rheumatoid arthritis, lupus, multiple sclerosis and other autoimmune diseases.

For milk lovers, I recommend almond milk or coconut milk as tasty substitutes, just be sure you get the unsweetened varieties. Here's why I don't usually drink soy milk.