Healthy Foods That Become Unhealthy When You Eat Them the Wrong Way

31. Canned Tuna: The Mercury Question

Canned tuna is an affordable and convenient source of protein and omega-3s. However, concerns exist regarding mercury content, a heavy metal that can accumulate in larger predatory fish. While levels vary, larger tuna species like albacore ("white" tuna) generally contain significantly more mercury than smaller species like skipjack ("light" tuna). Excessive mercury intake can pose health risks, especially for pregnant women and children. Opt for light or skipjack tuna most often and limit overall consumption per week according to health guidelines.

32. Excessive Fiber Intake (Too Much, Too Soon): Fiber Backfire

We all know fiber is essential for digestion, heart health, and blood sugar control. But drastically increasing your fiber intake overnight – whether from supplements or suddenly loading up on high-fiber foods like beans and bran – without allowing your gut to adapt can cause major digestive chaos. Think severe bloating, painful gas, and even constipation. Increase your fiber intake gradually over several weeks and ensure you're drinking plenty of extra water concurrently to help the fiber move through your system smoothly.