A Historical Perspective of the Understanding of the Link between Diet and Coronary Heart Disease.

The development of the understanding of the underlying causes of coronary heart disease has undergone several stages. Ecological studies, such as the Seven Countries' Study, showed a possible relationship between mortality in coronary heart disease and intake of saturated fats. The investigated area with the lowest rates of cardiovascular disease was the island of Crete, Greece. A discussion soon started to evolve around the Mediterranean diet, which at the time consisted of mainly foods of vegetable origin, olive oil and cereals of unrefined nature. Several clinical trials have been undertaken since, including the Lyon Heart Diet Study where it was clearly shown that both mortality and morbidity in coronary heart disease was substantially lowered by Mediterranean food compared to controls. Dean Ornish proved that an extreme regimen actually could reduce already existing sclerotic plaques, while the WHI study showed that a more modest diet change diet not cause the intended reduction in heart disease in middle-aged women. Another prospective study of a similar age group of women showed that a diet with a low glycemic load gave a good reduction in coronary heart disease. Multiple studies of different components of food have shown no positive result, pointing at the whole diet rather than its components of nutrients being of importance. Today, the experts agree on the optimal diet to prevent not only heart disease but also cancer forms and other chronic disease such as type 2 diabetes mellitus. This diet is consisting of a lot of fruit and vegetables, lots of fish, less salt and sugar, more unrefined cereals, beans and nuts. Going from a general notion of Mediterranean food to testing that food in clinical settings and testing nutrients as preventative agents, we can conclude that a generally healthy lifestyle, including a healthy diet, appropriate amounts of physical activity, good sleep and less stress, is the way to a heart healthy life.