The effect of cricket extract on high -fat diet fed rat was observed. It was shown that cricket extract prevented the increment of body weight by high -fat diet. The extract also decreased the value of AST in liver. The most significant effect of the extract was shown on lipid metabolism. The contents of total lipid and total cholesterol in liver and feces were reduced by the extract on dose-dependent. These statistically significant results were clear in $3\%$ extract treated group (HFD3) while were slight in $1\%$ extract treated group (HFD1). The same result was also shown in body fat content.