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Coca-Cola is a cola drink, similar to others in this category.
Cola drinks have 3 ingredients that possibly be harmful to health:
1. Sweeteners. Sugar in soft drinks (including non-cola drinks) increases
the possibility of dental caries ("cavities"). Non-nutritive sweeteners
such as saccharin and aspartame also have undesirable side-effects in
specific population segments. Nutritive sweeteners are a significant
source of calories in the diet (about 250 per serving of a soft drink).
2. Caffein. This "upper" is added specifically to cola drinks as a class.
It is a diuretic and can elevate blood pressure. It has been suggested as
connected to development of rheumatoid arthritis.
3. Phosphoric acid. This acid is typically only used in cola drinks, which
are very acidic (low pH) compared to other soft drinks. This can increase
the rate of enamel loss from teeth. Phosphates in general are a
nutritional problem when ingested in volume without corresponding calcium.
This results in decalcification of bone tissue, accelerating osteoporosis
in the aged.
The example of Coke removing tarnish from a penny is irrelevant to health
issues. Water and salt will cause iron to rust away, but they're both
essential to life. Your stomach acid is much stronger than that in Coke.
By the way, I've heard a microbiologist say he used to drink a Coke
quickly after accidentally sucking up diluent through a pipet. He claimed
the Coke was protective against the bacteria. I don't think I accept this
argument, but it shows the "flip-side" of the penny example.
Here are my recommendations based on a rational assessment of the above:
1. Soft drinks and coffee should be ingested in moderation. Avoid more
than 4 servings a day.
2. If you are at risk for osteoporosis, avoid soft drinks with phosphoric
acid (e.g., colas).
3. Drinking the diet form of soft drinks can eliminate 1000 calories or
more per day from the diet and will reduce the incidence of sugar-related
dental caries.
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