title: Effects of weight loss in obese subjects with normal fasting plasma glucose or impaired glucose tolerance on insulin release and insulin resistance according to a minimal model analysis.
abstract: We investigated effects of weight loss from diet and exercise regimen in obese subjects with normal fasting plasma glucose or impaired glucose tolerance (IGT) on insulin release capacity and insulin sensitivity. Eight subjects were recruited among visceral obesity patients (4 men, 4 women; age range, 24 to 57 years; body mass index [BMI], 32.8 to 60.3 kg/m(2)). All were admitted to Chiba University Hospital for 2 weeks, were treated with a tapering 5,023 to 2,930 kJ diet, and were given exercise equivalent to 628 kJ/d. For assessments, we used a combination of C-peptide secretion rate determination and minimal model analysis as previously reported. BMI and visceral fat area (V) significantly decreased (BMI on initiation v after intervention, 43.0 +/- 3.2 v 40.3 +/- 3.1 kg/m(2), P <.05; V, 224 +/- 22 v 188 +/- 22 cm(2); P <.05). Fasting immunoreactive insulin (F-IRI) and leptin concentrations decreased significantly. Capacity for insulin release in response to glucose increased in all subjects (first-phase insulin secretion [CS1], 4.66 +/- 4.05 v 6.81 +/- 4.57 ng/mL/5 min, P <.05), but the insulin sensitivity index (S(i)) did not change significantly. These data suggest that weight reduction early in development of type 2 diabetes can oppose progression of diabetes by improving capacity for insulin release.
authors.affiliation: Department of Clinical Cell Biology, Graduate School of Medicine, Chiba University, Chiba, Japan.
authors.forename: Yuriko
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Naotake
authors.initials: N
authors.lastname: Hashimoto
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Tokuyama
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kitagawa
authors.forename: Kazuo
authors.initials: K
authors.lastname: Takahashi
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yagui
authors.forename: Azuma
authors.initials: A
authors.lastname: Kanatsuka
authors.forename: Hideaki
authors.initials: H
authors.lastname: Bujo
authors.forename: Mayumi
authors.initials: M
authors.lastname: Higurashi
authors.forename: Saori
authors.initials: S
authors.lastname: Miyazawa
authors.forename: Shouji
authors.initials: S
authors.lastname: Yoshida
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Saito
mesh_terms: D000273:Adipose Tissue / Q000502:physiology; D000328:Adult; D001786:Blood Glucose / Q000378:metabolism*; D015992:Body Mass Index; D002096:C-Peptide / Q000378:metabolism; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000378:metabolism; D005081:Exercise Therapy; D005260:Female; D018149:Glucose Intolerance / Q000378:metabolism*; D006801:Humans; D007328:Insulin / Q000097:blood / Q000378:metabolism*; D007333:Insulin Resistance / Q000502:physiology*; D008055:Lipids / Q000097:blood; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D009765:Obesity / Q000178:diet therapy / Q000503:physiopathology* / Q000628:therapy*; D015431:Weight Loss / Q000502:physiology*
chemical_list: D001786:Blood Glucose; D002096:C-Peptide; D007328:Insulin; D008055:Lipids