It appears that for health, consistency is key.
A new study says those whose diet fluctuates may be more likely to suffer a heart attack or stroke.
Researchers in South Korea found people with the most ups and downs in their measurements were 127-percent more likely to die early than those who stayed consistent over time.
But they stress, the goal is not to maintain obesity or being overweight, but rather get to a healthy weight and maintain that throughout life.
The study didn't go into why yo-yo numbers are associated with poor health, but the results suggest that sticking with a plan to lower your weight or cholesterol may be just as important as the target number.
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Study: Yo-yo dieting can lead to heart attack, stroke