Fats and oils are inseparable ingredients of daily food habits of human life and they are important sources of fatty acids. Fatty acids are major components of cell membranes, act as energy stores, protect the organs from structural deformities, and also involved in the body's functions and regulations. Essential fatty acids (omega-3 and omega-6 fatty acids) are more beneficial than other fatty acids. Comparatively, omega-3 fatty acids have the capacity to lessen disease conditions like cardiovascular disease, cancer, arthritis, aging, inflammation and immune dysfunction. Also, protects from mental illness, increases skin health and promotes growth and development in newborns. Even though Fat has many key roles and specific functions in the body, excess intake results in diseased conditions. High intake of omega-6 fatty acids can intensify cardiovascular disease and immune dysfunction. Surfeit intake of saturated fat can escalate the chances of becoming obese for a long time and also cause cancer. Industrially produced trans fatty acids profoundly cause cardiovascular diseases and cancer. More intake of total fat and dietary cholesterol fosters the gestational diabetes miletus. However, practising proper intake of fat will help to lead a healthy life.