NTR CHAPTER 5 Lipids PDF

What are the primary functions of lipids in the body?

Lipids serve as structural components of cell membranes, act as energy storehouses, and function as important signaling molecules.

What is the most common type of lipid in the diet?

Triglycerides make up more than 95 percent of lipids in the diet.

What is the role of phospholipids in the body?

Phospholipids are crucial for building the protective barrier, or membrane, around the body's cells.

What distinguishes saturated fatty acids from unsaturated fatty acids?

Saturated fatty acids contain no double bonds between carbon atoms, while unsaturated fatty acids contain one or more double bonds.

What are essential fatty acids?

Essential fatty acids are fatty acids that the body cannot synthesize and must be obtained from the diet; they include omega-3 and omega-6 fatty acids.

What is the significance of HDL and LDL lipoproteins in relation to heart health?

HDL (high-density lipoprotein) is known as 'good cholesterol' as it helps carry cholesterol away from the arteries, while LDL (low-density lipoprotein) is known as 'bad cholesterol' because it can lead to plaque buildup in the arteries.

What is a major consequence of excess body fat?

Excess body fat can lead to issues such as cardiovascular disease due to the accumulation of cholesterol in arterial walls.

How do triglycerides function as an energy source?

Triglycerides store excess energy from food in adipose tissue, which can be accessed when the body needs energy.

What dietary change can improve the balance of omega-3 and omega-6 fatty acids?

Increasing the intake of omega-3 fatty acids through foods like fatty fish and nuts can help balance omega-6 fatty acids.

What is the relationship between dietary fats and fat-soluble vitamins?

Dietary fats help improve the absorption of fat-soluble vitamins (A, D, E, and K) in the digestive system.

What does the term 'bioavailability' refer to in the context of lipids?

Bioavailability refers to the degree to which nutrients or compounds are absorbed into the body; fats enhance the bioavailability of fat-soluble nutrients.

Why is it important to limit trans fats in the diet?

Trans fats are linked to increased risk of heart disease and can negatively impact cholesterol levels.

What are the characteristics of a healthy fat intake according to the Dietary Reference Intake Committee?

Fat calories should be limited to 20-35 percent of total calories, with most fats coming from polyunsaturated and monounsaturated sources.

What symptoms may indicate a deficiency in fatty acids?

Fatty acid deficiency may cause symptoms like feeling cold sooner, fatigue, and pressure sores on the skin.

What is the impact of dietary cholesterol on blood cholesterol levels?

Dietary cholesterol has a small impact on blood cholesterol levels; the body adjusts its own cholesterol production accordingly.

How do unsaturated fats compare to saturated fats in terms of health effects?

Unsaturated fats generally lower LDL cholesterol levels and are linked to heart health, while saturated fats may raise LDL levels.

What role do chylomicrons play in digestion?

Chylomicrons are lipoproteins that transport dietary lipids from the intestines to other locations in the body through the lymphatic system.