10 Foods You Should Never Eat After Age 30

7- Diet Mountain Dew and Fresca

Drinks like Mountain Dew and Fresca may look less chemical filled than cola because of their lighter hue, but that couldn’t be further from the truth. Instead of caramel coloring—the chemical that makes Coke brown—Diet Mountain Dew and Fresca are colored with brominated vegetable oil, a chemical used in rocket fuel and flame retardants. It’s been shown to have negative effects on thyroid hormones and fertility, a primary health concern of people in their 30s. What’s the connection? “Added chemicals like BVO can contribute to internal inflammation, which has been linked to obesity, a condition that can make it harder to conceive,” explains registered dietitian Isabel Smith, RD, CDN. Can’t kick your soda habit all together? Find out which colas are the best bet for your health and waistline in our ultimate report, every soda ranked by nutrition.