What the explanation is, that actually requires research. Anything from new food additives, changed lifestyle habits forced by the pandemic, increased chronic stress, screen addiction compromising other opportunities to be active, less walkable neighborhoods, more elevators, higher calorie diet, cost increase in healthy diet to just name a fraction of possible factors.
It shows what it shows.
What the explanation is, that actually requires research. Anything from new food additives, changed lifestyle habits forced by the pandemic, increased chronic stress, screen addiction compromising other opportunities to be active, less walkable neighborhoods, more elevators, higher calorie diet, cost increase in healthy diet to just name a fraction of possible factors.