Nitrates
Many foods, especially cured meats such as bacon and hot dogs, use nitrates to preserve color and maintain microbial safety. Nitrate is harmless, but it can convert to nitrite, which can form nitrosamines, a powerful cancer-causing chemical, in your body. Whenever possible, look for nitrate-free preserved meats. When you do eat foods containing nitrates, have a glass of orange juice at the same time (for instance, orange juice with your morning bacon). Vitamin C is known to inhibit the conversion to nitrosamines in your stomach