[Effect of body weight reduction on platelet function and serum lipoproteins in obese children (author's transl)].

In 11 obese children aged 11,9 +/- 1,3 years total cholesterol (C), triglycerides (TG), HDL-C, LDL-C and apolipoprotein B (Apo B) were estimated in serum after 3 weeks of hypocaloric diet (800 kcal, kJ). In vitro platelet function was evaluated using the tests of ADP-induced aggregation and platelet sensitivity to prostacyclin. The in vivo platelet activity was judged by estimating plasma levels of beta-thromboglobuline (beta-TG) and platelet factor 4 (PF4). A mean weight loss of 5,7 +/- 1,8 kg was observed. Before diet, serum-C, TG and lipoprotein-C concentrations were found to be within the so called "normal range". After three weeks of diet we observed a significant decrease of total-C, which could be accounted for by a decline in the atherogenic LDL-C; furthermore Apo B levels significantly decreased. Concerning the tests of platelet function only for beta-TG and PF 4 a marked decline (to about 50% of the initial values) could be seen. These preliminary results and changes in the lipoprotein are discussed in connection with a possible reduction of the risk for the development of atherosclerotic lesions.