There was a recent study on the effects of yo-yo dieting on women. The problem is that I cannot tell what it all means. The results of the study showed that:

There was an association between weight cycling — also known as "yo-yo dieting" — and the risk of sudden cardiac death. The increased risk was more than three-fold greater in these cyclers than in weight stable women. Weight cycling by overweight or obese women carried no excess risk of death, however. Similarly, women who reported a maintained weight loss or gain had no increased risk of death.

The sample size was large.

Lead investigator Dr. Somwail Rasla from Memorial Hospital in Rhode Island analyzed the weight history reported by nearly 160,000 postmenopausal women; follow up was about 11 years. Participants were categorized as underweight, normal-weight, overweight or obese at the start of the study. Then they were further listed as weight cyclers — those who repeatedly lost and regained weight, weight stable, steady weight gainers, and maintained weight loss.

But this was a self reporting and thus depended on the accuracy and truthfulness of participants' reports. So it is not the most reliable type of study.

http://acsh.org/news/2016/11/17/normal-weight-women-avoid-yo-yo-dieting-10451

I guess if I could interpret this, it might be Some Fad Diets are Dangerous, Very Dangerous.

From what I read it looks like it saying stable weight older women who yo-yo diet are at an increase risk of cardiac death. So if your weight is stable, don't go on these yo-yo diets.

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