&gt; <i>#1 piece of advise should be to not run a systemic calorie excess. </i><p>Sure, but that specific advice you quibble over is just a suggestion on how to achieve that result. A quote in the article from one of the professors expressly says:<p>&gt; <i>So if you ask how much weight you need to lose to make your diabetes go away, the answer is one gram. But that gram needs to be fat from the pancreas. At present the only way we have to achieve this is by calorie restriction by any means, whether by diet or an operation.</i><p>It&#x27;s worth emphasising the last bit: surgery is a much more effective way to restrict caloric intake than lifestyle changes alone. A very low percentage of people with obesity are able to lose weight and then maintain a healthy body composition without surgery, and the risks of gastric bypass seem completely justified in cases where it allows a patient to be &quot;cured&quot; of Type 2 Diabetes.