Monounsaturated fat vs polyunsaturated fat which is better

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  3. What are Polyunsaturated and Monounsaturated Fats?

Monounsaturated fat vs polyunsaturated fat which is better

Polyunsaturated and monounsaturated fat are both unsaturated fats. “Poly” means many unsaturated chemical bonds and “mono” means one unsaturated chemical bond. These unsaturated fats are often found in liquid vegetable oils.

  • Polyunsaturated oils are liquid at room temperature and in the refrigerator. Common sources of polyunsaturated fat are safflower, sesame and sunflower seeds, corn and soybeans, many nuts and seeds, and their oils.
  • Monounsaturated oils are liquid at room temperature but start to solidify at refrigerator temperatures. Canola, olive, and peanut oils, and avocados are sources of monounsaturated fat.
  • Both types of unsaturated fats may help lower your blood cholesterol level when used in place of saturated fat in your diet. Remember to be moderate in your intake of all types of fat.
  • Poly- or monounsaturated oils — and margarines and spreads made from these oils — should be used in limited amounts in place of fats with a high saturated fat content, such as butter, lard, or hydrogenated shortenings.
  • By substituting monounsaturated fat in your diet for saturated and polyunsaturated fats you may be able to keep HDL cholesterol levels high and LDL cholesterol levels low. Overall the highest intake of fat should be from the monounsaturated type (12 – 20 percent of total calories).

Tips for replacing saturated fats with unsaturated fats

  • Use oils containing monounsaturated fat like olive oil, canola oil, peanut oil, and sesame oil, instead of oils high in saturated fat like coconut oil and palm oil.
  • Use oils high in polyunsaturated fats like corn, soybean, safflower, sunflower, and cottonseed oils instead of coconut oil, palm oil, or hydrogenated vegetable fats.
  • Use liquid oils instead of butter, lard, or hardened vegetable shortening.
  • Eat foods high in unsaturated fats like fatty fish (salmon, mackerel, tuna) instead of meats high in saturated fat.
  • Incorporate foods high in polyunsaturated and monounsaturated fats like avocados, nuts, and olive oil into your salads instead of using products high in saturated fats like mayonnaise-based dressings.
  • Try the plant-stanol and sterol fortified products. These are made from naturally occurring substances in vegetable oils, nuts, corn, rice and other plants. These substances help block the absorption of cholesterol and help lower LDL cholesterol. Consuming 2-3 grams of plant stanol or sterols can lower LDL cholesterol up to 14%. Many products including margarine spreads, orange juice, granola bars, and yogurt are now fortified with plant stanol or sterol esters.

Many people believe that all fats are bad, and they make you obese. But, this is a false assumption; you need a certain amount of fat in your daily diet to keep your body healthy. There are two types of unsaturated fats known as monounsaturated and polyunsaturated fats; one of these types is healthier than the other. Therefore, it is important to understand the difference between monounsaturated and polyunsaturated fats to select the healthy option. The fatty acids in monounsaturated fats have single bonds and only one double bond whereas fatty acids in polyunsaturated fats have single bonds and more than one double bond. This is the main difference between monounsaturated and polyunsaturated fats. Both monounsaturated and polyunsaturated fats are associated with positive health outcomes, and these fats can help keep your body functioning healthily. This article explores the differences in chemical and physical properties of monounsaturated and polyunsaturated fats.

Monounsaturated fat vs polyunsaturated fat which is better

What is Monounsaturated Fat

Monounsaturated fat is a fat molecule that comprises of two types of smaller molecules known as mono-glyceride and fatty acids. These fatty acids have only one double bond. Fatty acids are made of long chains of carbon (C) atoms, and some of these carbon atoms are connected by single bonds (-C-C-). Fatty acids containing double bonds can react with hydrogen to form saturated fats.

Monounsaturated fat vs polyunsaturated fat which is better

Olives and olive are a source of Monounsaturated fats

What is Polyunsaturated Fat

Polyunsaturated fat is a fat or fatty acid that has both single bonds and double bonds. Nuts, seeds, algae, leafy greens, fish, and krill are considered as rich sources of polyunsaturated fats. These fats are highly susceptible to oxidation. When polyunsaturated fat-rich foods  are exposed to the atmosphere, they are susceptible to further oxidation and rancidity.

Monounsaturated fat vs polyunsaturated fat which is better

Sunflower seeds are rich in Polyunsaturated Fats.

Difference Between Monounsaturated and Polyunsaturated Fats

The differences between monounsaturated and polyunsaturated fat can be classified into following categories.

Definition

Monounsaturated Fat: Monounsaturated fat is a fat or fatty acid having only one double bond in their molecular structure.

Polyunsaturated Fat:Polyunsaturated fat is a fat or fatty acid that has more than one double bond in their structure.

Melting Temperature

Monounsaturated Fat:Monounsaturated fats have a higher melting point than polyunsaturated fatty acids. They are liquids at room temperature and semisolids or solids when refrigerated.

Polyunsaturated Fats: Polyunsaturated fats have a lower melting point than monounsaturated fatty acids. Due to their chemical structure, unsaturated fats have a liquid consistency at room temperature.

Most Common Examples

Monounsaturated Fat: Palmitoleic acid (16:1 n−7), cis-vaccenic acid (18:1 n−7) and oleic acid (18:1 n−9) are common examples.

Monounsaturated fat vs polyunsaturated fat which is better

Oleic Acid

Polyunsaturated Fat: Omega-3 fatty acids such as eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA) and Omega-6 fatty acids such as Gamma-linolenic acid (GLA), Arachidonic acid (AA) and Dihomo-gamma-linolenic acid (DGLA) are examples.

Monounsaturated fat vs polyunsaturated fat which is better

Linoleic acid

Most Common Sources

Monounsaturated Fat: Common sources include,

  • Cooking oils such as olive oil, sesame oil, and canola oil
  • Peanut butter
  • Nuts such as peanuts and cashews
  • Avocados
  • Olives
  • Sesame seeds
  • Healthy spreads that are labeled “ high oleic”
  • Red meat
  • Whole milk products
  • Cereals and related products such as corn oil, popcorn, whole grain wheat

Polyunsaturated Fat:Polyunsaturated fat can be found in

  • Seeds such as sunflower seeds, pumpkin seeds, flax seeds and chia seeds
  • Cooking oils including corn oil, safflower oil, and soybean oil
  • Nuts such as pine nuts and walnuts
  • Fatty fish including salmon, mackerel, herring, and tuna
  • Algae

Susceptibility to Oxidation

Monounsaturated Fat: When monounsaturated food is exposed to the atmosphere, it is susceptible to further oxidation and rancidity.

Polyunsaturated Fat:When polyunsaturated foods are exposed to the atmosphere, they are susceptible to further oxidation and rancidity and its rate of oxidation is high compared to monounsaturated fat.

Health Aspects

Monounsaturated Fat: Monounsaturated Fats are associated with various health benefits.

  • Reduce the risk of cancer development, cardiovascular disease, reduce LDL cholesterol (Bad cholesterol) and increase HDL cholesterol (good cholesterol)
  • Reduce the risk of rheumatoid arthritis

Polyunsaturated Fats: Polyunsaturated fats are associated with various health benefits.

  • Reduce the risk of cancer development
  • Prevent cardiovascular disease, platelet aggregation and hypertension
  • They have the anti-inflammatory properties and lower markers of inflammation in the blood such as C-reactive protein and interleukin 6.
  • Supplements are given to autism children and Alzheimer’s disease patients
  • Reduce the risk of rheumatoid arthritis
  • Help to control cholesterol levels

Inflammatory Properties

Monounsaturated Fat:Monounsaturated Fats have anti-inflammatory properties which is good for human health.

Polyunsaturated Fats:Polyunsaturated Fats have both anti-inflammatory and pro-inflammatory effects. As an example, ω-6 fatty acids are associated with pro-inflammatory effects that can cause negative health outcomes.

In conclusion, both monounsaturated and polyunsaturated fats have several roles in the human body. In addition to being the principal component of stored fat, they also serve as important building blocks of cell membranes and regulate inflammatory processes. In nutritional standpoint, both monounsaturated and polyunsaturated fats are better than saturated fat. But they are equally energy-dense molecules so you should consume both in self-control level as these can incorporate calories to the daily diet.

References

Okuyama, H., Ichikawa, Y., Sun, Y., Hamazaki, T. and Lands, W.E.M. (2006). ω3 Fatty Acids Effectively Prevent Coronary Heart Disease and Other Late-Onset Diseases – The Excessive Linoleic Acid Syndrome. In Okuyama, H. Prevention of Coronary Heart Disease. World Review of Nutrition and Dietetics. pp. 83–103.

Ricciotti, Emanuela and FitzGerald, Garret, A. (2011). Prostaglandins and inflammation. American Heart Association Journal, 31(5): 986–1000.

Scorletti, E. and Byrne, C. D. (2013). Omega-3 fatty acids, hepatic lipid metabolism, and nonalcoholic fatty liver disease. Annual review of nutrition, 33(1): 231–48.

Vafeiadou K, Weech M, Altowaijri H, et al. Replacement of saturated with unsaturated fats had no impact on vascular function but beneficial effects on lipid biomarkers, E-selectin, and blood pressure: results from the randomized controlled Dietary Intervention and VAScular function (DIVAS) study. Am J Clin Nutr. 2015 Jul;102(1):40-8.

De Souza RJ, Mente A, Maroleanu A, et al. Intake of saturated and trans unsaturated fatty acids and risk of all-cause mortality, cardiovascular disease, and type 2 diabetes: systematic review and meta-analysis of observational studies. BMJ 2015; 351:1-16.

Image Courtesy:

“Olive oil” by Oregon State University (CC BY-SA 2.0) via Flickr

“Gfp-sunflower-seeds” By Yinan Chen – www.goodfreephotos.com (gallery, image), (Public Domain) via Commons Wikimedia

“Oleic-acid-based-on-xtal-1997-2D-skeletal” By Ben Mills – Own work, (Public Domain) via Commons Wikimedia

“Linoleic acid shorthand formula” By Wolfgang Schaefer – created with Microsoft (R) Paint 5.1 (Public Domain) via Commons Wikimedia

Monounsaturated fat vs polyunsaturated fat which is better

Why is monounsaturated better than polyunsaturated?

Monounsaturated fats have only one carbon-to-carbon double bond in their molecular structure. They help lower bad (LDL) cholesterol levels and help in maintaining the overall health of cells.

Is polyunsaturated fat the healthiest?

For good health, the majority of the fats that you eat should be monounsaturated or polyunsaturated. Eat foods containing monounsaturated fats and/or polyunsaturated fats instead of foods that contain saturated fats and/or trans fats.

What is the difference between polyunsaturated and monounsaturated fats?

Monounsaturated fats: This type of unsaturated fat contains only one double bond in its structure. Monounsaturated fats are typically liquid at room temperature and include canola oil and olive oil. Polyunsaturated fats: This type of unsaturated fat contains two or more double bonds in its structure.

Is monounsaturated fat the healthiest fat?

The Bottom Line Monounsaturated fats are healthy fats most commonly found in olive oil, nuts, seeds and some animal-based foods. Diets high in monounsaturated fats can help with weight loss and may reduce risk factors for heart disease, as long as they don't add extra calories to your diet.