Mixed
In patients with type 2 diabetes, higher BMI (overweight/obese) is associated with lower all-cause mortality compared to normal weight, a phenomenon known as the 'obesity paradox'.
If you have type 2 diabetes, do not use the 'obesity paradox' as an excuse to maintain a high BMI. While some studies show obese diabetics live longer than lean ones, this is likely due to biases like muscle mass or fitness, not the fat itself. Standard medical advice remains to lose weight if overweight, as it improves metabolic markers and does not increase mortality risk.
there is increasing evidence that overweight or obese patients with type 2 diabetes mellitus experience lower mortality compared with patients of normal weight. This paradoxical finding, known as the 'obesity paradox,' occurs in other chronic diseases, and in type 2 diabetes mellitus is particularly perplexing given that lifestyle intervention with one goal being weight reduction is an important feature of the management of this condition.
Why this rating
Based on observational epidemiological studies with potential for significant bias (reverse causation, confounding), not RCTs proving causality.
Source
The Evidence for an Obesity Paradox in Type 2 Diabetes Mellitus
Seung Jin Han et al. · Diabetes & Metabolism Journal · 2018
DOI 10.4093/dmj.2018.0055
More from this paper
- The observed 'obesity paradox' in diabetes is likely non-causal and explained by biases such as reverse causation, confounding by fitness, and body composition differences (muscle mass).Good
- Higher cardiorespiratory fitness and greater muscle mass/strength are associated with lower mortality in diabetic patients, potentially explaining the obesity paradox.Good
Related findings · Mixed
- Bariatric surgery (VSG and RYGB) is the most effective and sustainable treatment for obesity, producing marked and sustained weight loss that non-surgical interventions cannot match.Strong
- Severely protein-deficient diets (2–3% energy) induce lean body mass loss and metabolic imbalance, whereas adequate protein intake (0.66 g/kg/d minimum) is a prerequisite for maintaining muscle, bone, and physiological function.Strong
- For patients with Class III obesity (BMI >39.9 kg/m2), metabolic bariatric surgery (MBS) is significantly more effective than any currently approved medication, with BilioPancreatic Diversion (BPD) showing the highest estimated weight loss.Strong
This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →