The problem with pointing obesity as the culprit is that ourworldindata has the same chart for obesity, where almost all countries are increasing at the same rate as US. But just US has this stark high cancer rate.
US is a standout in obesity - only Arab countries and Native Pacific are close to it where obesity has different character than in US. And may be the obesity and cancer has the same cause - high processed sugar diet for example.
"The United States (U.S.) is the leading country in ultra-processed food (UPF) consumption, accounting for 60% of caloric intake, compared to a range of 14 to 44% in Europe. "
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