Given the rise in body weight observed over the past several years among the general population in France, self-reported weight and height data—despite their reporting bias—allow for the tracking of trends in overweight and obesity over long periods. The compilation of Santé publique France barometers from 1996 to 2017 has provided a time series on self-reported body weight among adults spanning more than 20 years. Among men, the proportion of those reporting themselves as overweight (including obesity) increased between 1996 and 2008, rising from 40% to 48%, respectively, and appears to have since stabilized around 48–50%. Obesity affected 7% of men in 1996 and rose to over 14% in 2016, before dropping significantly to 13% in 2017. Among women, body mass has increased steadily. Self-reported overweight (including obesity) among women was less than 25% in 1996 and reached 39% in 2017. Reported obesity among women, which was less than 6% of women in 1996, reached 14% in 2017. These reported anthropometric data from Santé publique France’s surveys provide insight into the evolution of overweight and obesity over time. These trends must nevertheless be confirmed by the collection of measured anthropometric data. Regardless of these trends, however, levels of overweight and obesity among adults in France remain very high and require the intensification of prevention policies in this area.