>What I know for sure is that apples in the 50s had at least an order of magnitude more calories than apples today.
At least an order of magnitude more calories? Just to be on the same page, you're saying that apples in the 50s had at least 10x as much calories as they do today? :DD
You realize an apple is ~10-12% sugar by weight, right? The rest is just water and fibre. So an apple with an order of magnitude more calories would mean a solid block of sugar. (alternatively, an apple that's 10x the size, but we have photos of 50s apples, and they were roughly the same size as today)
At least an order of magnitude more calories? Just to be on the same page, you're saying that apples in the 50s had at least 10x as much calories as they do today? :DD
You realize an apple is ~10-12% sugar by weight, right? The rest is just water and fibre. So an apple with an order of magnitude more calories would mean a solid block of sugar. (alternatively, an apple that's 10x the size, but we have photos of 50s apples, and they were roughly the same size as today)