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BMI values between 18.5 and 24.9 are considered to be a "normal" or "healthy" weight. BMI values between 25 and 29.9 are considered "overweight," while BMI values of 30 and above are considered "obese." BMIs above 25 are unhealthy and have been shown to increase the risk of certain chronic diseases. BMIs under 18.5 are considered "underweight."