In the USA, over the past 15 years, there has been a dramatic increase in the number of obese individuals. At the base of this sudden change in the physique of Americans (but not just Americans) are bad nutrition habits and the spread of a lifestyle in which physical activity is neglected or drastically reduced. Since Italy generally follows the USA when it comes to lifestyle habits, we can predict that obesity will become more widespread amongst us too. The available data, presented in Figure 4, is alarming. The data shows how in some regions, the proportion of overweight or obese children is more than 40%. The data comes from the project “Health Watch: Promoting good health and growth in children of primary school age,” organized by the Ministry of Health and the University, and are available at the website: http://www.epicentro.iss.it/okkioallasalute/ Here is a major issue, which will plunge the national health system into severe crisis. Because obesity means higher rates of diabetes, hypertension, strokes and heart attacks. These are cardiovascular and metabolic diseases that are far easier to prevent than to cure, that cost a lot in terms of pharmaceutical spending (drugs generally should be taken throughout life) and spending on care (particularly for stroke, heart attacks and kidney failure).