This was made by an anonymous and hilarious guy who goes by the fake name John Pemberton, who was the inventor of Coca-Cola.
FACT CHECK TIME:
The Mayo Clinic says "reasonable" amounts of diet soda (a can or two) aren't harmful. However, HuffPo notes a Purdue study that found even one can per day is enough to increase risks associated with diabetes, metabolic syndrome, and heart disease.
"Consuming large amounts of rapidly digested sugar in high fructose corn syrup causes a spike in blood sugar and insulin, which can lead to inflammation and insulin resistance, which may increase risk of stroke, heart disease, diabetes, obesity, and cancer."
Here's a HuffPo article detailing a study from Europe that supports the spike in blood sugar and insulin/diabetes. Also there's a heart disease link noted in the American Journal of Clinical Nutrition and the Harvard School of Public Health. Several articles support association with increased cancer risk, particularly pancreatic.
This May 2012 CNN article contains information about how soda can also accelerate aging and cause high cholesterol. The aging issue is tied to preservatives and the cholesterol issue is tied to HFCS creating belly fat.
And the American Heart Association talking about 450 calories from sugar-sweetened beverages per week (or three cans of soda)? Yeah, they totally said that.
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