This post features a chart showing butter consumption since 1926
The chart below plots butter consumption trends versus the incidence of cancer and heart disease. Since 1926, consumption of butter has dropped precipitously, at the same time cancer and heart disease has soared. Many factors may be involved as to what causes cancer and heart disease but for sure it’s not the consumption of butter
because these trends are going in the opposite direction.
because these trends are going in the opposite direction. 
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