The relationship between nutrition and health is complex and cannot be described in a set of simple rules. However, simplistic half-truths are dominating public perception and shaping policies concerning our food and the nature of our diet. For example, a recent ad campaign depicted saturated fats as poisons and accused several American food companies of poisoning America because they use tropical oils and beef tallow. The person behind this ad campaign has no formal training in nutrition or medicine, but has forced major companies to reformulate their products. As a most recent example, several fast food restaurants have changed the type of fat used for the deep frying of french fries. Until recently, they used a fat mixture containing vegetable oil and beef tallow.