Fatty acids, which are building block of fat, are long chain of carbon and hydrogen atoms. Essential fatty acid are those needed by human body that are only be obtain through food. Some fats are harmful.
The so-called “good” fats can be found in nuts, avocado and other vegetables. The molecular structure of unsaturated fat causes it to be lower in calories than other fats. Molecular structure of unsaturated fat shows spaces available for hydrogen atoms to band.
These fats are found mostly in animal products. It is recommended that people reduce their consumption of saturated fats in order to stay healthy. In a molecule of saturated fat every space for hydrogen is filled.
Trans Fat are unsaturated fat which have been partially saturated with hydrogen to extend their shelf life. Unfortunately these trans fat are found to elevate “bad” cholesterol and should be avoided