The expression "you are what you eat" has a longstanding history. It revolves around the notion that an individual's nutritional choices significantly impact their health and overall well-being, either positively or negatively.

The quality of food consumed is meant to provide the body with essential nutrients and energy (calories, vitamins, minerals, fiber, and sugars) for proper functioning. When the body is not supplied with adequate nutrients, metabolic processes suffer, leading to a decline in health. While the concept seems straightforward—eating well leads to good health—modern society is witnessing an increase in lifestyle-related conditions like food intolerances, digestive disorders, hormonal imbalances, and metabolic dysfunctions. Distinguishing between food intolerances and food allergies is crucial. While lactose and gluten intolerance are widely recognized, mentioning other types such as salicylates and glutamate often elicits confusion. Simplifying it by labeling it as an allergy is sometimes easier than spending time explaining the differences.

However, there exists a significant distinction, primarily related to two essential systems in the human body—the enteric nervous system (digestive system) and the immune system. Food intolerance complicates modern dietary habits by mimicking various health issues, often leading to inaccurate diagnoses. Continued exposure to triggering foods or food groups intensifies the body's adverse reactions. Managing food intolerance involves reducing exposure to the specific chemicals causing the reactions, allowing nerve endings to settle and return to their normal state. Over time, this approach may even reduce sensitivities to the point where they no longer recur..