With the exception of the Great Depression and the second world war, average weights have been increasing in the USA for more than a century. We talk about this

With the exception of the Great Depression and the second world war, average weights have been increasing in the USA for more than a century. We talk about this as if it's a recent shift, because we finally went from being nearly-universally-underweight to nearly-universally-obese, but the increase is relatively steady and very long term. It's also present in all wealthy countries. The US led the way by being wealthier earlier, but all countries that have wealth see a steady rise in average weight over time.