Thanks to apps, individuals can measure an immense set of activities and conditions creating huge stocks of personal data. These data can also be shared on social networks. Self-monitoring functions allow individuals to have monitored pathological conditions and to improve life-styles. Many of these apps concern diets. In fact, the turn of the XXI century has witnessed a huge increase of obesity, in rich and in poor countries. Yet, diet apps - even if useful under many respects - can also be considered as examples of an approach which does not consider the influence of inequality and social factors on health. As a consequence, “technological solutionism” is strictly related to the process of medicalization of life and its reductionism.