Question

1. what are the three classes of lipids?2. functions of fat in the body:a. energy storage – what is the advantage of storing energy as fat rather than as carbohydrateb. which body structures are made of fat?c. how does fat provide protection to the body?d. name 2 molecules made in the body from fats?3. functions of fat in fooda. define “energy-dense” –b. name the fat-soluble nutrients:i. fat soluble vitamins _____, ___, ___, and ___.ii. essential fatty acids: ___________ and ___________.b. sensory qualities – why is fat delicious?c. satiety – why is it a good idea to include some fat in your diet if you are trying to lose weight?4. triglyceridesa. 2 parts of a triglyceride:1.2.b. what are the different types of fatty acids?1.2.3.c. the more ___________ a fatty acid is, the more _____________ it is at room

Explanation:

1. Lipids are categorized into three main classes based on their structure and function.
2. Fat's bodily functions relate to storage, structure, protection, and biosynthesis; food functions cover density, nutrients, sensory aspects, and satiety. Triglycerides have distinct components, and fatty acids differ by saturation which affects physical state.
3. Each question is answered with standard biological/ nutritional science facts.

Answer:

1. Triglycerides, Phospholipids, Steroids
2. Functions of fat in the body:

a. Fat stores more energy per gram (9 kcal/g vs. 4 kcal/g for carbohydrates) and requires less storage space as it is anhydrous.
b. Adipose tissue (body fat), myelin sheaths (around nerve cells), and cell membranes (phospholipids, a lipid subclass)
c. Fat forms adipose tissue pads that cushion organs (e.g., kidney, heart) and insulate the body to maintain core temperature.
d. Cholesterol, bile acids (or hormone-like prostaglandins)

1. Functions of fat in food:

a. "Energy-dense" means a food contains a high amount of calories relative to its weight or volume.
b.
i. Vitamin A, Vitamin D, Vitamin E, Vitamin K
ii. Linoleic acid (omega-6), Alpha-linolenic acid (omega-3)
c. Fat carries flavor compounds in food, creates a smooth, palatable texture, and triggers sensory pleasure responses in the brain.
d. Fat increases satiety (fullness) by slowing stomach emptying, which reduces overeating and helps control calorie intake.

1. Triglycerides:

a.

1. Glycerol backbone
2. Three fatty acid chains

b.

1. Saturated fatty acids
2. Monounsaturated fatty acids
3. Polyunsaturated fatty acids

c. The more saturated a fatty acid is, the more solid it is at room temperature