Calcium helps to maintain the strength of your bones and teeth, keeping them from becoming weak and brittle. Many dairy products contain a fair amount of calcium in them, including milk and cheese. Many vegetables also contain calcium without the high fat content, such as broccoli and kale.
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I would say that the answer is B. Includes recommendations that are unsafe. Most Hollywood diet crazes are unhealthy, set unrealistic goals and have been known to make people sick.
D. Originated with a credible source