Body composition in children with type 1 diabetes in the first year after diagnosis: relationship to glycaemic control and cardiovascular risk
- 1Department of Paediatric Endocrinology and Diabetes, Southampton General Hospital, Southampton, UK
- 2Department of Children's Services, Milton Keynes Hospital NHS Foundation Trust, Milton Keynes, UK
- 3Department of Medical Physics, University Hospital of Wales, Cardiff, UK
- 4Department of Child Health, University Hospital of Wales, Cardiff, UK
- 5Department of Child Health, Wales School of Medicine, Cardiff University, Cardiff, UK
- Correspondence to Dr Nikki L Davis, Department of Paediatric Endocrinology and Diabetes, G floor C Block, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK;
- Received 28 November 2011
- Accepted 13 December 2011
- Published Online First 30 January 2012
Introduction Rapid weight gain is often observed following initiation of insulin therapy in children with type 1 diabetes mellitus (T1DM) and girls are particularly at risk of becoming overweight. The authors evaluated body composition changes in children during the first year after diagnosis and related this to markers of cardiovascular risk.
Methods Body mass index (BMI) and body composition measured by whole body dual energy x-ray absorptiometry (DEXA) were assessed in 30 patients (18 boys) with T1DM 3–10 days after diagnosis, 6 weeks later and at 1 year, and on two occasions 1 year apart in 14 controls (8 boys). Cardiovascular risk markers were assessed in T1DM subjects at 1 year.
Results T1DM subjects had lower BMI SD scores (SDS) at diagnosis than controls (mean (SD) BMI SDS −0.67 (1.34) vs 0.20 (1.14), p<0.05) and reduced percentage body fat (20.3% (4.6) vs 24.5% (7.7), p<0.05). T1DM subjects normalised their body composition at 6 weeks and this was maintained 1 year later. Girls with diabetes were thinner than boys at diagnosis (BMI SDS −1.64 (1.02) vs −0.02 (1.17), p<0.05) and at 1 year (BMI SDS −0.58(0.9) vs 0.65 (0.98), p<0.05). Girls had higher glycated haemoglobin (HbA1c) (8.8% (1.2) vs 7.8% (1.0), p<0.05), insulin dose (1.01 (0.30) vs 0.82 (0.18) U/kg/day, p=0.04), total cholesterol (4.30 (0.45) vs 3.79 (0.50) mmol/l, p<0.05) and high-density lipoprotein (2.62 (0.53) vs 2.02 (0.37) mmol/l). High sensitivity C reactive protein and fibrinogen were in the normal range and there were no differences between genders.
Discussion Insulin deficiency at diagnosis of diabetes causes a catabolic state that is predominantly lipolytic. Body composition normalises within 6 weeks of treatment, though girls remain thinner than boys both at diagnosis and 1 year thereafter, in contrast to published findings. Despite girls being prescribed a larger insulin dose, their HbA1c and cholesterol levels are higher at 1 year suggesting increased insulin resistance and cardiovascular risk.
Competing interests None.
Ethics approval This study was approved by the South and East Wales Local Research Ethics Committee.
Provenance and peer review Not commissioned; externally peer reviewed.