To deal with the COVID-19 pandemic, several restrictive measures have been put in place that cause significant disruption to lifestyle habits. We conducted a review of the literature to study the impact of these changes on the body weight of populations. We observed changes in eating habits (increase in the number of snacks and consumption of sugary products), a decrease in physical activity and an increase in stress that can exacerbate eating disorders. Increased efforts must be made to support patients during this difficult time, including public health measures to counteract these behaviours in order to prevent health complications.