What is fat? - George Zaidan

Key Concepts:

• Triglycerides: The molecules that make up fat.
• Fatty Acids: The building blocks of triglycerides, consisting of a glycerol backbone and three long chains.
• Saturated Fats: Fatty acids with only single bonds between carbon atoms. Generally considered unhealthy in excess.
• Unsaturated Fats: Fatty acids with one or more double bonds between carbon atoms. Generally considered healthy.
• Cis Fats: A type of unsaturated fat where the hydrogens and carbons are on the same side of the double bond.
• Trans Fats: A type of unsaturated fat where the hydrogens and carbons are on opposite sides of the double bond. Considered very unhealthy.
• Partial Hydrogenation: The process by which unsaturated fats are converted into trans fats.

What is Fat?

• Fat, specifically in the context of food and health, is composed of molecules called triglycerides.
• Triglycerides consist of a glycerol backbone and three fatty acid chains.
• The structure of these fatty acid chains determines the properties and health effects of the fat.

Differences in Fatty Acids

• Length: Fatty acids can vary in length (short or long).
• Type of Bond: The type of bond between carbon atoms in the fatty acid chain is crucial.
  • Saturated Fats: Contain only single bonds.
  • Unsaturated Fats: Contain one or more double bonds.

Saturated vs. Unsaturated Fats

• Unsaturated fats are generally considered healthier than saturated fats.
• Saturated fats are generally considered unhealthy in excess.

Cis vs. Trans Fats

• Double bonds in unsaturated fats have two possible configurations: cis and trans.
• Cis configuration: Hydrogens and carbons are on the same side of the double bond.
• Trans configuration: Hydrogens and carbons are on opposite sides of the double bond.
• Trans fats are created through partial hydrogenation.
• Trans fats are exceptionally harmful to health, even worse than saturated fats.

Why Trans Fats are Bad

• The 3-D shape of a molecule determines how it interacts within the body.
• Trans fats interfere with biological pathways due to their shape.

Identifying Trans Fats in Food

• The most reliable way to identify trans fats is to look for "partially hydrogenated" in the ingredients list.
• Nutrition labels can be misleading because the FDA allows manufacturers to claim "0" grams of trans fat if the product contains less than 0.5 grams per serving.
• Serving sizes can be manipulated to minimize the reported trans fat content.

Olive Oil vs. Pancake Mix Example

• Olive oil is 100% fat, primarily unsaturated, and contains no trans fat.
• Pancake mix is only 11% fat, but more than half of that fat is saturated or trans fat.
• This illustrates that the type of fat is more important than the amount of fat.

Conclusion

• The type of fat consumed is more important than the total amount of fat.
• The shape of a fat molecule determines its health effects.
• Avoid trans fats by checking ingredient lists for "partially hydrogenated" oils.