
At best, they appear to block 50–65% of carb-digesting enzymes ( 5). How Effective Are Carb Blockers?Ĭarb blockers only prevent a portion of the carbs you eat from being digested.

However, their effectiveness may be limited and studies provide conflicting results. They are advertised as allowing you to eat as many carbs as you desire without providing any calories.
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Carb blockers are usually marketed as weight loss aids.
