Nutrition is not a simple science

In the distant past, studying nutrition was a relatively simple science. Diseases such as scurvy, pellagra, anaemia and goitre were solved by developing hypotheses and running experiments until they found what was missing in people's diets.

However, nutrition is no longer that simple. Today, our greatest health problems are related to overeating. People eat too many calories from too much low-quality food, causing chronic diseases like cancer, obesity, diabetes, and heart disease. These diseases develop over a lifetime, and fixing them is not as simple as adding a few oranges to the diet.