Fig. 4. Relative search popularity obesity, diet, dietary medicine, dietary herbal medicine, dietary supplements, xenical, saxenda, qsymia, wegovy (2016 to 2024 september, monthly). (A) Minors, (B) young, (C) middle-aged, (D) old. The x-axis represents the relative search score, and the point at which the RSV of the 'diet' was highest was set to 100. The y-axis represents the period. The trend line of the 'diet' and its formula was calculated and displayed under the premise of a linear trend line. RSV: relative search volume.