Obesity, diabetes and their metabolic correlates in middle-aged adults with Down syndrome.
In adults with Down syndrome, obesity alone does not forecast diabetes or bad cholesterol—only leptin climbs.
01Research in Context
What this study did
Doctors measured body fat and blood markers in the adults with Down syndrome. Ages ranged from 30 to 55. They checked sugar, cholesterol, blood pressure, and leptin.
The team asked: does extra weight create the same diabetes and heart risks seen in other adults?
What they found
Overweight adults with Down syndrome had normal sugar, cholesterol, and blood pressure. Only leptin, a hunger hormone, was high.
In short, fat alone did not predict diabetes or bad lipids in this group. The usual warning signs were missing.
How this fits with other research
Rasing et al. (1992) and Ferreri et al. (2011) already showed that 50-a large share of adults with Down syndrome are obese. McQuaid et al. (2024) now says those extra pounds do not bring the metabolic harm we expect.
Wee et al. (2015) found that obesity lowers aerobic capacity in Down syndrome but does not cut peak heart rate further. Together, the papers paint a picture: weight hurts fitness, yet standard metabolic red flags stay quiet.
This looks like a contradiction to typical medical teaching, but it is not. The difference is the population. Down syndrome biology may protect against classic obesity-linked diabetes, even while body mass rises.
Why it matters
When you see a client with Down syndrome who is heavy, do not assume diabetes is around the corner. Still promote exercise for heart and joint health, but track leptin and real symptoms, not just BMI. Use this knowledge to reduce weight stigma and tailor health goals to the person, not the scale.
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02At a glance
03Original abstract
BACKGROUND: Obesity in adults without Down syndrome is associated with an adverse metabolic profile including high prevalence of pre-diabetes and diabetes, high levels of insulin, non-high-density lipoprotein (HDL) cholesterol, leptin and high-sensitivity C-reactive protein (hsCRP) and low levels of HDL and adiponectin. We examined whether obesity in middle-aged adults with Down syndrome is also related to an adverse metabolic profile. METHODS: This cross-sectional study included 143 adults with Down syndrome, with a mean age of 55.7 ± 5.7 years and 52.5% women. Body mass index (BMI) was classified as underweight (BMI < 18.5 kg/m2 ), normal (BMI 18.5-24.9 kg/m2 ), overweight (BMI 25-29.9 kg/m2 ) and obese (BMI ≥ 30 kg/m2 ). Diabetes was ascertained by history or by haemoglobin A1c (HbA1c) as normal glucose tolerance (HbA1c < 5.7%), pre-diabetes (HbA1c 5.7-6.4%) and diabetes (HbA1c ≥ 6.5%). We measured non-fasting lipids, hsCRP, insulin, adiponectin and leptin. RESULTS: The majority of the sample had an overweight (46.9%) or obesity (27.3%) status. However, there was a relatively low prevalence of pre-diabetes (9.8%) and diabetes (6.9%). Overweight and obesity status were not associated with lower HDL and adiponectin and higher insulin, non-HDL cholesterol and hsCRP as expected in adults without Down syndrome. However, overweight and obesity were strongly associated with higher leptin (P < 0.001). CONCLUSIONS: The only metabolic correlate of obesity in middle-aged adults with Down syndrome was high leptin levels. Our findings are limited by non-fasting laboratory tests but suggest that middle-aged adults with Down syndrome do not have the adverse metabolic profile related to obesity found in adults without Down syndrome.
Journal of intellectual disability research : JIDR, 2024 · doi:10.1111/jir.13103