Not sure this has been mentioned but if you are looking at keeping off weight beyond 10 years you have to take age into account. The older you get the more you have to control your diet(not a "diet" but diet as in "what you eat")and the harder you have to work in terms of burning calories.
What worked at 30 is no longer enough at 40 and even harder at 50. A person could have been maintaining a lifestyle for 10 years but still gained 10 pounds so I am not sure that is reflected in these studies.
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