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- The average person has 25 - 35 billion fat cells distributed throughout the body.
- Women require more fat than men ~ particularly in anticipation for pregnancy.
- Fats are the most energy dense of all macronutrients.

Visible fats

We add these to our foods, add them to cooking or find them on our foods before they are cooked

Easy to limit or avoid

Invisible fats

Contained within a pre-packaged or pre-prepared food, we eat it without much thought

Difficult to reduce intake without avoiding the food or eating in very small portions

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1. Every triglyceride contains one molecule of glycerol and three fatty acids (basically, chains of carbon atoms).

2. Fatty acids may be 4 to 24 (even numbers of) carbons long, the 18-carbon ones being the most common in foods and especially noteworthy in nutrition.

3. Fatty acids may be saturated or unsaturated. Unsaturated fatty acids may have one or more points of unsaturation – that is, they may be mono-unsaturated or polyunsaturated.

4. Of special importance in nutrition are the polyunsaturated fatty acids known as omega-3 fatty acids and omega-6 fatty acids.

5. The 18-carbon fatty acids are linolenic acid (omega-3) and linoleic acid (omega-6). Both are essential fatty acids that the body cannot make. Each is the primary member of a family of longer-chain fatty acids that help to regulate blood pressure, blood clotting, and other body functions important to health.

Number of Double bonds

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Lipids are an essential component of the cell membrane. The structure is typically made of a glycerol backbone, 2 fatty acid tails (hydrophobic), and a phosphate group (hydrophilic). As such, phospholipids are amphipathic.

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- The average fat intake for fat per adult is recommended to be 44g - 77g of fats per day
- 20 to 35% of total energy intake per day

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o    Monounsaturated FA

o    Polyunsaturated FA

o    Saturated FA

o    Trans fat

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- Carrier for fat soluble vitamins and phytochemicals

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- 2x as many kJ as carbs or protein
- 37 kJ/g

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- Help body development
- Source of energy (885 kCal / 100g)
- Holds organ in shape
- Protecting body
- Help producing hormones