Calories and Nutritions in Oats

According to My Food Data, a 100g serving of raw, uncooked oats contains 389 calories.

According to My Food Data, a 1kg serving of raw, uncooked oats contains 3890 calories.

According to My Food Data, 1 cup (156g) serving of raw, uncooked oats contains 607 calories.

Oats provide a lot of health benefits such as the ones listed below:

• Oats are packed with antioxidants: Oats are high in antioxidants and beneficial plant compounds called polyphenols, with a unique group known as avenanthramides, which are primarily found in oats. Research published in October 2020 by Pema Raj, Nancy Ames, and others titled “The effects of oat ingredients on blood pressure in spontaneously hypertensive rats” shows that avenanthramides may help reduce oxidative stress by increasing nitric oxide production, leading to improved blood flow. 
• Oats may help regulate blood sugar: Oats can lower blood sugar, especially in those with type 2 diabetes. A 2021 review article published in European Journal of Clinical Nutrition shows that adding oat beta-glucan to meals can reduce insulin levels.
• Oatmeal may support weight loss: Consuming satisfying foods can help reduce calorie intake and support weight loss according to a 2021 study spearheaded by Devendra Paudel. The beta-glucan in oatmeal slows stomach emptying, increasing feelings of fullness. 
• Oats may improve skin care: Oats, specifically finely ground oats known as colloidal oatmeal, are used in many skin care products. The FDA approved colloidal oatmeal as a skin-protective substance in 2003. Oat-based products are known to relieve itching and irritation according to a study led by Andrea Perrelli, et al in 2018, particularly for conditions like eczema.
• Oats may lower the risk of childhood asthma: Asthma is a common chronic lung condition in children, characterized by inflammation of the airways. Research titled “Lipid Nutrition in Asthma” suggests that introducing oats early in a child's diet may reduce the risk of developing asthma, but the potential for oats to prevent asthma is still under investigation.
• Oats may relieve constipation: Studies show that oat bran, the fiber-rich outer layer of oats, can help alleviate constipation which affects 16 out of 100 adults and about 33 out of 100 adults who are ages 60 and over, and improve digestion, especially in individuals with ulcerative colitis.

Oats have many benefits but also some downsides, as listed below:

• Gas accumulation: A January 2022 study by Salla Laito, Niina Valkonen, and Oskar Laaksonen found that oats may cause mild gastrointestinal symptoms, such as flatulence, in people with a sensitive gut or IBS when consumed with pulses. Breath hydrogen levels increased after eating oat flour compared to rice flour, but these levels did not fully explain the symptoms. Both sensitive and control groups reported more discomfort after the oat meal, though no severe symptoms occurred.
• Anemia: According to research by L. Rossander-Hulthén, A. Gleerup, and L. Hallberg, oat products, particularly oat bran and porridge, can inhibit the absorption of non-heme iron due to their high phytate content. This effect is significant enough to be a concern, especially for groups with critical iron needs, such as children, teenagers, and women in their fertile years. The heat treatment of oats, designed to prevent rancidity, further reduces the effectiveness of iron absorption.
• Celiac disease: A position paper published in the Canadian Journal of Gastroenterology and Hepatology titled Consumption of pure oats by individuals with celiac disease, suggests that pure and uncontaminated oats can be safe for individuals with celiac disease when consumed in limited amounts, which is 70g per day for adults and 25g for children

Yes, oats are good for your health, offering benefits for heart health, diabetes prevention, and digestion. A 2021 analysis titled “A Review of Health-Beneficial Properties of Oats” found that consuming beta-glucan which is found in oats daily can reduce LDL (bad) cholesterol, while a 2016 study published in the National Library of Medicine of 54,871 Danish adults aged 50-64 linked oat consumption to a lower heart attack risk. A 2021 meta-analysis review led by Wehrli et al. found that oats promote good gut bacteria and prevent constipation.

One cup of cooked oatmeal is a healthy serving size, says Jessica Crandall Snyder, RDN, CDCES, the CEO of Vital RD in Centennial, Colorado or 1/2 cup of raw oats, according to Julie Upton, MS, RD, CSSD.

Oats are high in fiber, so consuming too much may cause changes in stool appearance and frequency. One to two servings of oats per day is recommended for most people. 

The calorie content of oats is similar across all types, as they have the same nutrition per gram. The only difference is the way the oats are cut and processed, which impacts cooking time and texture, but not the calorie count.

Oats were the last cereal grain to be domesticated by Western civilization around 3,000 years ago. The earliest records of oats date back to Egypt’s 12th Dynasty, around 2000 B.C., and possibly even earlier in China. But ancient civilizations like the Egyptians did not prioritize oats, unlike wheat and barley. Back then, the Greeks and Romans viewed oats as a lesser food, reserved for animals. The Romans introduced oats to Britain, where the climate proved ideal for cultivation. In Scotland, oats, particularly porridge, hold significant cultural importance, celebrated annually during the World Porridge Making Championship in Carrbridge. Although the Scots were not the first to plant oats, their geography and climate made them early adopters.