This may be sarcastic, but I do think that modern obesity is partially driven by the availability of convenient "good tasting" foods. If you eat like typical Americans ate in 1960, then everyday meals are serviceable but don't tempt you to overeat from sheer deliciousness. Making delicious foods that you were tempted to overeat was more work, and often associated with holidays or other special occasions. But now we have foods that have been co-optimized for low cost and palatability that you can eat after heating for 3 minutes in the microwave oven. Overeating has never been more accessible or tempting.