guide
Obesity: What the Studies Really Show
Obesity is often told as a matter of willpower. Physiology tells another story: a body that actively defends its weight, with hormones pushing towards regain. Here is what the large trials really achieved, what they did not, and what that changes for someone starting out.
A state the body defends
There is a sentence heard everywhere that explains things badly: just eat less and move more. If it were that simple, results would be everywhere. What physiology shows is less comfortable. When weight comes down, the body does not stay neutral. Resting metabolism drops a little more than the loss of mass alone predicts, hunger hormones rise, satiety hormones fall. In other words, the body defends the weight it had, the way it defends its temperature. That does not mean nothing moves. It means willpower alone is fighting a system pushing the other way, and a method that ignores that system ends up failing, with the person having little to do with it.
What the large trials achieved
Two trials are worth knowing. DiRECT, run in British general practice and published in the Lancet in 2018 then followed up in 2019, put 46 per cent of participants into remission of their type 2 diabetes at one year, and 36 per cent at two years, with no glucose lowering medication. Look AHEAD, published in the New England Journal of Medicine in 2013, followed 5145 adults living with obesity and type 2 diabetes: around 8.6 per cent weight loss at one year, better glucose control and better fitness held for years. These are real results, measured, obtained under medical supervision. They say that changed eating changes the disease, and not only the number on the scale.
What they did not achieve
This is the part rarely read, and it is the most useful. Look AHEAD did not reduce cardiovascular mortality, despite years of better control. DiRECT speaks of remission, not cure: the underlying vulnerability remains, regaining weight brings the diabetes back, and participants stayed under medical follow up from start to finish. Neither tested a miracle food, a spice or a supplement. What was tested was a sustained change in eating, supervised. Anyone telling you a diet ends diabetes for good is going further than the data. The honest position is narrower, and it still stands up.
The number that counts is not the headline one
The most telling result in DiRECT is hidden beneath the headline percentage. Among participants who lost 15 kg or more, around 86 per cent were in remission at one year. Between 10 and 15 kg, the proportion fell to nearly 57 per cent. Under 5 kg, it collapsed to around 7 per cent. In other words, it is not the name of the diet that decides, it is the amount of fat that actually leaves the liver and the pancreas. That should reassure more than discourage: there is no secret method to find, there is an order of magnitude to reach, and several roads to it. Choosing the road then becomes a question of what you can hold for a long time, not of what sells best.
Where to start, and with whom
The first useful move is not to remove calories, it is to remove what pushes you to eat without hunger. Heavily processed products, sugary drinks, the continuous snacking that never lets the digestive system rest. The second is to build meals around whole foods, with enough protein for satiety to do part of the work for you. The third is sleep, discussed further in this journal, because it changes what appetite asks for the very next day. None of this replaces a doctor. If you take a treatment, in particular for diabetes or blood pressure, talk to them before you change what you eat: when eating changes, some treatments need adjusting, and that adjustment is their job, not yours.
Continue reading on the Sehtin journal
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This article relays the public teachings of Dr. Diaa Al-Awadi for educational and informative purposes. It is not medical advice. Consult your physician before any dietary change. Legal notice.