The food is basic need of humans and this basic need causes the various changes in the human body. In many studies, correlations between nutrition knowledge and dietary behavior have failed to reach statistical significance, leading researchers to question the relevance of nutrition knowledge to food choice, and the value of nutrition education campaigns. This study used a well-validated nutrition knowledge measure to examine the link between knowledge and intake of fat, fruit, and vegetables. The objective of this study is to aware the society or people about the intake of food in human body. This review presents 4 lines of evidence supporting a role for proteins in the regulation of food intake and maintenance of healthy body weight It is concluded that the amount of food consumed and the degree of short-term satiety are strongly influenced by the protein content and possibly the source of the protein. Although the evidence presented indicates that more research is necessary to establish the role of protein in the regulation of long-term food intake and body weight, this role is less obvious. New functional foods, food formulations, and dietary guidelines for reaching healthy body weights could result from this kind of study. Particularly for fruits and vegetables, it has been demonstrated that some degree of nutrition knowledge mediates the socio demographic difference in intake. This implies that knowledge plays a significant role in explaining variations in food consumption and highlights the importance of utilizing more advanced statistical tools to study correlations between knowledge and food intake.