I can confirm that. During the pandemic I mostly stayed at home, eating, among other things, a lot of potatoes, and sweets stuff, but also eating, basically, all day out of boredom. I gained a lot of weight. After the pandemic I tried for five months to lose weight by hiking, which, however, didn't help. Instead I have been slowly losing weight after I returned to Thailand by sweating the weight off, i.e. by often not turning on the aircon, amazing, but true.