Rolled vs Steel-Cut vs Quick Oats: What is the difference?

Steel cut oats, rolled oats, and quick oats differ by the amount of processing they undergo. Each can be part of a nutritious diet.

When thinking of a healthy, hearty breakfast, a hot bowl of oats might come to mind.

There are several types to choose from, including rolled oats, steel cut oats, and quick-cooking oats, which differ in their nutrient profile and processing methods.

This article explains the key differences between these varieties so that you can decide which one makes the most sense for your diet and lifestyle.

What are steel-cut, quick, and rolled oats?

Steel-Cut Oats

Steel-cut oats, also known as Irish oats, are whole oat groats that have been chopped into pieces using steel blades. They are the least processed form of oats among the three types mentioned. The process involves cutting the groats into two or three pieces using sharp metal blades, which helps retain more of the oat bran and fiber. This results in a chewy texture and nutty flavor.

Nutritional Profile: Steel-cut oats have a slightly lower glycemic index compared to rolled oats because they are less processed. They are rich in fiber, particularly beta-glucan, which has been shown to help reduce cholesterol levels and improve heart health.

Rolled Oats

Rolled oats, also known as old-fashioned oats, are made by steaming oat groats and then rolling them into flakes using heavy rollers. This process flattens the oats into flakes and partially cooks them, making them quicker to prepare than steel-cut oats.

Nutritional Profile: Rolled oats retain a good amount of fiber and nutrients, although they may have a slightly higher glycemic index compared to steel-cut oats due to the steam heating and flattening process. They are versatile and commonly used in oatmeal, granola bars, and baked goods.

Quick Oats

Quick oats are very similar to rolled oats but are steamed for a longer period and rolled thinner. This additional processing further reduces the cooking time, making quick oats the fastest to prepare among the three types.

Nutritional Profile: Quick oats retain a similar nutritional profile to rolled oats but may have a slightly higher glycemic index due to their finer texture and faster cooking time. They are commonly used in instant oatmeal packets and recipes where quick cooking is desired.

Differences in Cooking and Texture

• Steel-Cut Oats: Take the longest to cook (usually 20-30 minutes) and have a chewy texture.

• Rolled Oats: Cook faster than steel-cut oats (about 5-10 minutes) and have a softer, creamier texture.

• Quick Oats: Cook the fastest (around 1-3 minutes) and have a very soft texture.

Health Benefits Supported by Research

Additionally, oats are naturally gluten free. However, people with celiac disease should choose varities that are certified gluten free to avoid those that may have been contaminated with gluten during processing.

Just a half cup, or 40 grams (g), of dry, rolled oats contains:

Calories: 152

Protein: 5 g

Fat: 3 g

Carbs: 27 g

Fiber: 4 g

Thiamin: 15% of the Daily Value (DV)

Iron: 9% of the DV

Magnesium: 13% of the DV

Phosphorus: 13% of the DV

Zinc: 14% of the DV

Copper: 18% of the DV

Selenium: 22% of the DV

Oats are also loaded with beneficial compounds, including antioxidants and beta-glucan, a type of soluble fiber linked to health benefits.

For example, the beta-glucan found in oats is effective at lowering both LDL (bad) and total cholesterol, which may help keep your heart healthy.

One study of 80 people with high cholesterol found that consuming 70 g of oats for 28 days led to an 8% reduction in total cholesterol and an 11% reduction in LDL (bad) cholesterol.

Additionally, oats have been shown to aid weight loss and stabilize blood sugar levels.

The beta-glucan in oats helps slow digestion, leading to an increased sense of fullness and a more gradual spike in blood sugar.

Heart Health

Numerous studies have demonstrated that regular oat consumption can improve cardiovascular health:

• Cholesterol Reduction: The high beta-glucan content in oats has been consistently linked to reductions in total and LDL (bad) cholesterol levels, thereby lowering the risk of cardiovascular diseases (1, 2).

• Blood Pressure Regulation: Oats may help in maintaining healthy blood pressure levels due to their rich potassium content and beneficial effects on blood vessel function.

Blood Sugar Control

• Oats have a relatively low glycemic index, which means they cause a slower rise in blood sugar levels compared to refined grains. This property is beneficial for individuals with diabetes or those aiming to manage their blood sugar levels effectively.

Weight Management

The high fiber content in oats contributes to increased satiety, helping individuals feel fuller for longer periods. This can aid in weight management by reducing overall calorie intake.

Digestive Healthy

The soluble fiber in oats supports digestive health by promoting regular bowel movements and maintaining gut integrity. It acts as a prebiotic, nourishing beneficial gut bacteria.

Therapeutic Applications

Beyond general health benefits, oats have been explored for their therapeutic potential in various conditions:

Skin Health

Colloidal oatmeal is used in skincare products due to its soothing and anti-inflammatory properties, beneficial for conditions like eczema and dry skin.

Athletic Performance

Oats, being a source of complex carbohydrates and protein, are favored as a pre-exercise meal to sustain energy levels and promote muscle recovery post-exercise.

Is one type more nutritious?

While each type of oats—steel-cut, rolled, and quick—offers unique textures and cooking times, they all provide significant nutritional benefits supported by scientific research. Steel-cut oats, with their minimal processing, may retain slightly more nutrients and have a lower glycemic index compared to rolled and quick oats. However, rolled oats and quick oats remain highly nutritious options suitable for various dietary needs and preferences.

Incorporating oats into a balanced diet can contribute to overall health, offering fiber, protein, vitamins, minerals, and antioxidants that support heart health, digestive function, and weight management.

Quick oats have a higher glycemic index

Steel-cut and rolled oats may have a lower glycemic index than quick oats.

Foods with a high glycemic index cause more rapid spikes in blood sugar, while foods lower on the glycemic index provide a slower release of energy and can help stabilize blood sugar.

For this reason, steel-cut or rolled oats may be the best choice to support better blood sugar control.

However, quick oats can also be included in a balanced diet by pairing them with toppings high in protein or fat, such as nuts or seeds, to support blood sugar control.

Which type should you choose?

All three types of oatmeal are highly nutritious and can fit into a well-rounded diet. Therefore, the most important thing is to choose oatmeal that fits best with your lifestyle and preferences.

For example, the chewy texture and nutty flavor of steel-cut oats may be delicious to some but too hearty for others.

Meanwhile, rolled and quick oats have a milder taste and cook down to a creamy, smooth consistency.

And since steel-cut oats are the least processed, they take the most time to prepare, which could be a turn-off for some people.

No matter what type of oat you choose, opting for plain, unsweetened oats instead of flavored packaged varieties can help limit your intake of added sugar.

Too much added sugar can contribute to a number of conditions, including heart disease, diabetes, and obesity.

For this reason, consider adding your own toppings — such as fresh fruit, nuts, or seeds — to unsweetened oats to keep added sugar to a minimum.

How to incorporate oats into your diet

Breakfast Options

Classic Oatmeal

Recipe: Cook oats with water or milk (dairy or plant-based) until creamy. Add toppings like fruits (berries, banana slices), nuts (almonds, walnuts), seeds (chia seeds, flaxseeds), and a drizzle of honey or maple syrup.

Variations: Try overnight oats for a no-cook option by soaking oats in milk and yogurt overnight in the fridge, then topping with fruits and nuts in the morning.

Oatmeal Pancakes or Waffles

Recipe: Mix oats with flour, eggs, milk, baking powder, and a sweetener of choice. Cook on a griddle for delicious pancakes or in a waffle iron for crispy waffles.

Variations: Add mashed banana or pumpkin puree to the batter for added flavor and nutrients.

Snack and Meal Additions:

Granola and Bars

Recipe: Make homemade granola by mixing oats with nuts, seeds, dried fruits, and a sweetener, then baking until golden brown. Alternatively, prepare energy bars with oats, nut butter, honey, and mix-ins like chocolate chips or dried fruits.

Smoothies

Recipe: Blend oats into smoothies for added fiber and texture. Combine with fruits, yogurt, milk, and a handful of spinach or kale for a nutrient-packed breakfast or snack.

Recipe: Substitute part of the flour with oats in muffins, cookies, bread, and cakes for added fiber and texture.

Variations: Try savory options like adding oats to meatloaf or using them as a crunchy topping for casseroles.

Tips for Incorporating Oats:

Preparation: Experiment with different types of oats (steel-cut, rolled, quick oats) based on texture preference and cooking time.

Portion Control: Stick to recommended serving sizes to manage calorie intake and maximize nutritional benefits.

Customization: Customize oats with various toppings and mix-ins to suit your taste preferences and dietary needs.

Meal Planning: Incorporate oats into weekly meal plans to ensure balanced nutrition and variety.

By incorporating oats creatively into your routine, you can enjoy their nutritional benefits while adding variety and flavor to your meals and snacks. Adjust recipes and serving sizes to fit your dietary goals and preferences, making oats a versatile and wholesome addition to your daily diet.

The bottom line

Oats are a fiber-rich grain that has been linked to a number of health benefits.

Although rolled and steel-cut oats have a lower glycemic index, quick oats have a similar nutrition profile.

However, packaged instant varieties can contain a lot of added sugar, so it’s a good idea to choose plain, unsweetened oat varieties whenever possible.

References:

Anderson JW, et al. Oat-bran cereal lowers serum total and LDL cholesterol in hypercholesterolemic men. American Journal of Clinical Nutrition. 1990.

Steffen LM, et al. A review of whole grains and human health. Journal of Nutrition. 2003.

Slavin JL. Dietary fiber and body weight. Nutrients. 2013.

Gibson GR, et al. Dietary prebiotics: current status and new definition. British Journal of Nutrition. 2010.

Rebello CJ, et al. Oat β-glucan increases postprandial cholecystokinin levels, decreases insulin response and extends subjective satiety in overweight subjects. Nutrition Reviews. 2014.

Clark MJ, et al. Effects of oat β-glucan on appetite and food intake in healthy human subjects. Journal of the American College of Nutrition. 2007.

Meydani SN. Potential health benefits of avenanthramides of oats. The Journal of Nutrition. 2014.

Sur R, et al. Avenanthramides, polyphenols from oats, exhibit anti-inflammatory and anti-itch activity. Journal of Drugs in Dermatology. 2008.

Gonçalves AL, et al. Chemical composition, functional properties and processing of oat: a review. Food Chemistry. 2011.

Clark MJ, et al. Effects of oat β-glucan on appetite and food intake in healthy human subjects. American Journal of Clinical Nutrition. 2007.

Harvard T.H. Chan School of Public Health. The Nutrition Source - Whole Grains. Accessed June 2024.

Fernandes G, et al. Nutritional and physicochemical characterization of oat bran lipid and protein fractions. Journal of Food Science. 2020.

Foster-Powell K, et al. International table of glycemic index and glycemic load values: 2002. American Journal of Clinical Nutrition. 2002.

Whitehead A, et al. Cholesterol-lowering effects of oat β-glucan: a meta-analysis of randomized controlled trials. American Journal of Clinical Nutrition. 2014.

Seetharaman K, et al. Evaluation of different types of oats based on chemical composition, processing characteristics, and nutritional attributes. Journal of Agricultural and Food Chemistry. 2018.