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Does Obesity Cause Severe COVID-19 Complications?

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By Apollo 24/7, Published on - 08 August 2020, Updated on - 18 October 2022

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A lot of research around the risk of severe COVID-19 infection has mainly focused on people with co-morbid conditions, the elderly, and individuals with chronic illnesses such as diabetes, heart diseases, respiratory conditions and so on. However, recent research has revealed that obesity-related conditions can also cause significant complications in COVID-19 infected people. In this article, we will understand the health risks of obesity, its relationship with COVID-19, and the precautions that should be taken to avoid severe illness. Let us start by understanding what obesity is.

What is obesity?

According to the World Health Organization (WHO), obesity is defined as abnormal or excessive fat in the body. Obesity can be measured using the body mass index (BMI), which is a person’s weight (in kg) divided by the square of their height (in meters). A person with a BMI of 30 or higher is in the obese range; between 18.5 and 25 is the normal and between 25 and 30 is considered overweight. Obesity is already known to risk a factor for several chronic diseases, with many affected people needing to seek medical help.

How does Coronavirus affect obese people?

In a recent press release, the Centers for Disease Control and Prevention (CDC) included obesity (BMI of 30 or higher) as a risk factor that could cause severe COVID-19 related illness.
In obese people, the immune system does not work as effectively as it does in healthy individuals. Hence, people with obesity are more likely to require Intensive Care Unit (ICU) admission and Invasive Mechanical Ventilation (IMV), when infected by the Coronavirus.
Listed below are a few important reasons why obese people with COVID-19 infection are at higher risk:
  • Obesity hypoventilation syndrome (OHS): It is a condition in which obese people have poor breathing control that leads to lower oxygen and higher carbon dioxide in their blood. Since COVID-19 is known to affect oxygen saturation in the blood for some people, individuals with obesity may therefore be at higher risk. It is recommended that such people should check their SpO2 levels every day using a pulse oximeter.
  • Inflammation and ‘the cytokine storm’: Being obese can cause chronic inflammation, which triggers the production of small molecules or proteins called cytokines. Research has found that some patients with COVID-19 develop a serious condition known as cytokine storm syndrome (CSS), where the immune system loses the ability to differentiate the good cells from virus affected cells, causing it to go into the hyperactive mode and start destroying all cells, causing serious health hazards.
  • ACE-2 protein in fat cells: The fat cells in our body have higher levels of ACE-2 proteins. Obese people have an excess of fat cells in their body. Previous researches suggest that the Coronavirus has a great affinity towards the ACE-2 protein found in the fat cells. According to available clinical evidence, the Coronavirus can attack fat cells and can live there for a longer duration. As a result, obese people can be more prone to infection even after recovering from the symptoms of COVID-19.

Clinical evidence of the relationship between obesity and severe COVID-19 outcomes

  • New York study: In the study, out of 3,615 COVID-19 positive patients who were hospitalized, 775 (21%) had a BMI of 30-34 kg/m2 and 595 (16%) had a BMI of ≥ 35 kg/m2. A total of 1370 (37%) patients were found to be obese with a BMI of ≥ 30 kg/m2. Patients who were highly obese (BMI >34 kg/m2) and were less than 60 years of age were 3.6 times more likely to be admitted to the ICU compared to patients in the same age group but had a BMI of lesser than 30.
  • UK study: The study conducted on 17,000 COVID-19 confirmed cases revealed that patients who were obese (BMI >30 kg/m2) had a 33% greater risk of dying compared to non-obese COVID-19 patients. Another study of critically ill patients in intensive care centers in the UK found that nearly 34.5% were overweight, 31.5% were obese, and 7% highly obese. This made up a total of 73%, compared to 26% of individuals who had healthy BMIs.
  • French study: The study correlated body mass index BMI and the requirement for IMV (Invasive Mechanical Ventilation). About 124 COVID-19 confirmed ICU-admitted patients were enrolled for this study. The clinical result showed that overweight (BMI 25-30 kg/m2), obese (BMI 30-34 kg/m2) and severely obese (BMI>34 kg/m2) patients were in higher numbers compared to non-obese patients.
  • China study: This study conducted in Shenzhen, China was published in the Journal of Diabetes Care. Out of 383 COVID-19 positive patients, 41 (10.7%) were found obese during hospital admission. The study revealed that obese COVID-19 positive patients (BMI>28 kg/m2) showed relatively higher rates of cough and fever symptoms compared to non-obese COVID-19 patients.

How can obese people tackle COVID-19?

  • Strictly adhere to COVID-19 health safety guidelines: The first thing you need to do is follow the general guidelines and safety precautions outlined for Coronavirus. You should wash your hands frequently with soap and water for 20 seconds or apply alcohol-based hand rub with a minimum of 60% alcohol. Maintain social distancing (minimum 6 feet) with both outsiders and family members who are daily office goers. Wear a mask without fail if you need to step out.
  • Weight management: Controlling your weight is the key to staying fit and healthy. Obesity is the underlying cause of many conditions like diabetes, hypertension, etc. According to the CDC, an obese person should regularly take prescribed medicines if they have an underlying health condition. If the doctor has prescribed you anti-obesity pills or ACE-2 inhibitors, do not forget to take them regularly as it can minimize the risk of getting severely infected.
  • Physical activity: You can start a daily exercise and workout session at your home. Apart from workouts, you can also do activities like cycling, jogging, house-cleaning, gardening, stairs climbing which can help in burning your calories and staying healthy.
  • Dietary recommendation: It is better to choose healthy plant-based foods like veggies, fruits, and cereals, or lean proteins. Try to avoid fast foods or processed packed foods as these are major causes of developing obesity. Olive oil for cooking is highly recommended for obese people. Dairy foods like 1 cup of milk or yoghurt or 1 ½ ounce of cheese can be consumed, but they must be fat-free. Include immune boosters in your diet chart to increase your body’s capability to fight infection. While these are just a few examples of healthy foods, it is important to work with a trained nutritionist to arrive at a personalized dietary recommendation for weight loss, and adhere to it for the best outcomes.


Obesity is generally linked to an unhealthy lifestyle, unhealthy eating habits, financial limitations, or psychological issues. However, obesity can also be genetic, triggered by illness, or the side effect of long-term medications. Previous researches have shown that our immune system, inflammation, and obesity are related to one another and considered as risk factors for severe COVID-19 complications. Hence, it is best to follow your doctor's recommendations, develop a routine for physical activity and exercises, adopt healthy eating habits, and work towards attaining a healthy weight.

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