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Effect of Feed Restriction in Modeling of Dietary Obesity
Yeoung Mi Cho,Sunhee Shin,Dongsun Park,Jeong Hee Jeon,Min-Jung Jang,Jwa Jin Kim,Jae Wook Kim,Hyeong-Jin Ji,Chang Hwan Kim,Seongjin Baek,Seok-Yeon Hwang,Gonhyung Kim,Yun-Bae Kim 한국실험동물학회 2007 Laboratory Animal Research Vol.23 No.4
Ad libitum feeding of normal diet to rats usually leads to overweight, showing higher body-mass index than 25, while the supplementation of high (20-40%) content of lard or beef tallow in the diet to make a high-fat diet (HFD)-induced obesity rather decreases body weights partially due to decrease in feed intake of HFD or occurrence of diarrhea. In our study, for modeling dietary obesity, rats were subjected to feed restriction by 20 and 40% with normal diet or HFD supplemented with 25% of lard for 6 weeks. Ad libitum (100%) feeding of HFD decreased body weight gain and body fat in rats, resulting from a lower feed intake and transient diarrhea, compared to that of animals fed normal diet. In comparison with ad libitum-feeding groups, HFD restricted to 60 and 80% resulted in higher body weight gain and body fat compared with the normal diet with corresponding restriction to 60% or 80%. The changes in body and fat weights exhibited a good relationship with blood lipids profiles and leptin level in feed restricted groups. In addition, body fat and lipid profiles were confirmed to be parallel with the lipid accumulation in the liver and blood parameters associated with liver function. Based on the results, it is suggested that an appropriate degree (80%) of dietary restriction could be a candidate of modeling HFD-induced obesity for the screening of antiobesity substances.