الفهرس 
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Abstract
The purpose of this study is to examine the evidence for a number of the most popular plant parts/ food processing by-products that are proposed to enhance fat burning have some research to support or not. The selected plant parts as fat burners study includes some technological, chemical and nutritional aspects.
Mango peel powder (MPP), onion skin powder (OSP) and tomato pomace powder (TPP) were prepared and analysis for their chemical composition, physical properties, bioactive compounds and antioxidant activities.
Rats (n=36 rats), were housed individually in wire cages in a room maintained at 25 ± 2 0C and kept under normal healthy conditions. All rats were fed on basal diet for one-week before starting the experiment for acclimatization. After one week period, the rats were divided into two main groups, the first group ( 6 rats) still fed on basal diet and the other main group (30 rats) was feed with diet-induced obesity (DIO, product no.D1245, Research Diets, Inc. NJ, See Table 4) for 8 weeks which classified into five sub groups as follow:
group (1), fed on diet-induced obesity (DIO) as a positive control; group (2), fed on DIO containing 5 % MPP; group (3), fed on DIO containing 5 % OSP; group (4), fed on DIO containing 5 % TPP, group (5), fed on DIO containing 5 % mixture, MPP + OSP+ TPP by equal parts.
At the end of experiment period, 8 weeks, blood samples were collected after 12 hours fasting using the abdominal aorta and rats were scarified under ether anesthetized. Blood samples were analyzed for serum glucose, blood lipid profile and biological antioxidants.
present study concluded that: high content of the total phenolic compounds of the different tested plantsKand the addition of these extracts to diets led to decrease in liver fat and improve immunity.