What Research Really Says About Ultra-Processed Foods and Health
Walk into any supermarket, and you’ll likely be surrounded by ultra-processed food options. Frozen dinners, sugary cereals, processed meats, packaged snacks, and sodas are the classic examples. These foods are industrially manufactured products made mostly from refined ingredients, additives, and substances extracted from foods rather than whole foods themselves. Ultra-processed foods often contain compounds that are not typically found in home kitchens, such as emulsifiers, artificial flavorings, preservatives, colorings, and stabilizers added to improve taste, preserve texture, and prolong shelf life.
Today, ultra-processed products often make up a major portion of modern diets. While they offer a lot of convenience, recent studies linked them to major health concerns. Research finds that diets high in ultra-processed foods can contribute to many health issues, including obesity, cardiovascular and metabolic disorders, disruption of gut microbiome, cancer, and poor mental health.
Worldwide, 11 million deaths per year are attributed to poor diets, including those with high sodium, low whole-grain, and low fruit content. Unhealthy diets contribute to hypertension, obesity, heart disease, diabetes, and cancers, especially gastric and colorectal cancers.
Ultra-processed foods are often designed to be hyper-palatable by combining sugar, salt, fat, and flavor enhancers in ways that stimulate reward centers in the brain and encourage continued eating. Many processed foods are also softer and easier to chew, so people eat too much too quickly, before the body’s fullness signals can register.
However, not all foods are equally ultra-processed. For example, vegetable oils, butter, cheeses, and honey are also processed foods, but they typically contain fewer or no additives compared to sweetened cereal or microwave dinners. Pasteurizing milk, canning beans, and freezing vegetables are also forms of food processing, which actually preserve nutritional value, while still offering convenience to consumers.
These nuances can be puzzling for people, who constantly face conflicting dietary advice, aggressive food marketing, and confusing health claims. In this dietary climate, nutritional counseling has become crucially important. “Nutrition professionals are uniquely positioned to translate complex scientific research into practical, realistic guidance that people can apply in everyday life,” says Kim Hekimian, PhD, Director of Columbia University’s Institute of Human Nutrition (IHN) Master of Science in Nutrition program. “Our curriculum is built to equip nutritionists with the knowledge needed to help patients understand how ultra-processed foods affect health, provide advice on how to identify these foods—and ultimately help people avoid the diseases they cause.”
Obesity, Diabetes, and Metabolic Health
According to the CDC, the U.S. health system spends $173 billion annually on obesity-related health issues. Studies find that people who consume higher amounts of ultra-processed foods tend to have increased rates of obesity, diabetes, and metabolic disorders.
Researchers believe that ultra-processed foods are often calorie-dense but low in essential nutrients. They may contain high levels of refined carbohydrates and added sugars that rapidly spike blood sugar and insulin levels. Over time, repeated spikes may contribute to insulin resistance, which drives type 2 diabetes. The body also tends to store extra calories in the form of fat, contributing to obesity. Additionally, research shows that ultra-processed diets can negatively affect hormones involved in hunger and satiety. Some studies suggest these foods may disrupt the body’s natural appetite regulation, making it harder for the body to recognize fullness, so people keep eating more.
During their one-year Master's in Human Nutrition program, IHN students study these topics in depth. Students take two semesters of Biochemical and Physiological Bases of Nutrition courses designed to build an expert knowledge of how the body processes and uses nutrients. They can also choose to take an elective course, Obesity: Etiology, Prevention, and Treatment.
IHN graduates share that the program sparked their interest in metabolic science, crucial for understanding the underlying biology of diseases. “The MS program helped instill in me a love for metabolism that furthered my passion for researching metabolic reprogramming in various disease states,” says recent IHN alum Michael.
Cardiovascular Disease, Hypertension, and Inflammation
Multiple studies have linked ultra-processed foods to increased risks of heart attacks, strokes, and high blood pressure, naming several mechanisms as culprits. Ultra-processed foods are often high in sodium, sugars, and unhealthy fats, all of which can contribute to high blood pressure, elevated cholesterol, and inflammation. Chronic inflammation plays a major role in the development of atherosclerosis, the buildup of plaque inside arteries, leading to cardiovascular disease.
As part of their curriculum, IHN students study Integrative Nutrition and Pathophysiology, a course designed to understand the role of nutrition in the development and treatment of chronic conditions, including cardiovascular disease. The course is broken into several units, one of which specifically focuses on heart health and the appropriate nutrition therapies that aim to improve patient conditions.
In addition to studying disease causes, IHN students take the Essentials of Nutrition Counseling and Medical Nutrition Therapy class, in which they learn to apply these skills in practical settings. Students also have the opportunity to practice their counseling skills by participating in Columbia Student Medical Outreach (CoSMO), a free clinic that serves uninsured patients in Washington Heights and Northern Manhattan.
IHN alumni appreciate the knowledge they built during their master's program, as well as the opportunity to put their expertise into practice.
My year at the IHN deepened my understanding of the link between diet and chronic disease. It challenged me to think critically about scientific literature, disease mechanisms, and nutrition-related health disparities, says Max (MS '20).
Mental Health, Brain Function, and the Gut Microbiome
A number of studies found associations between high consumption of ultra-processed foods and increased risks of depression, anxiety, and even cognitive decline. Researchers believe that additives commonly used in processed foods may affect the gut microbiome, which in turn affects the brain via the so-called gut-brain axis. The gut microbiome plays a role in neurotransmitter production, which impacts emotional health.
Diets high in processed foods tend to be lower in nutrients important for brain health, such as omega-3 fatty acids, fiber, vitamins, and antioxidants. Insufficient amounts of these nutrients may reduce the gut microbial diversity, which can lead to mental health issues.
The Increased Cancer Risk and the Immune System
Research has linked ultra-processed food intake to higher risks of certain cancers, particularly colorectal cancer. Some studies suggest that certain chemical compounds generated during high-temperature, industrial processing and packaging can act as potential carcinogens. Other findings suggest that certain emulsifiers, preservatives, and other artificial ingredients used in ultra-processed foods may damage the intestinal lining, promote chronic inflammation, and cause immune system malfunction. At the same time, ultra-processed foods often replace fiber-rich, nutrient-dense whole foods that help protect digestive health and reduce cancer risk.
IHN’s curriculum includes understanding how the disrupted biological processes within the body increase cancer risks. During their Integrative Nutrition and Pathophysiology course, students study metabolism, nutrient exchange, and how altered biological processes may affect the immune system or lead to cancer.
These immersive studies build a strong foundation for preventive healthcare. Instead of treating diseases after they develop, IHN graduates are well-prepared to help patients lower their risk factors before serious illness occurs. By helping patients gradually replace heavily processed foods, snacks, and sugary drinks with higher-fiber, nutrient-packed alternatives, the program graduates can prevent serious health conditions before they take hold.
Conclusion
A degree in nutrition can play a powerful role in helping patients navigate the problem of ultra-processed foods and the chronic diseases linked to them. Nutrition professionals have the optimal foundation to translate complex scientific research into practical, realistic guidance that people can apply in everyday life.
At the individual level, nutrition professionals can counsel patients on how diet influences health. Many people struggle to identify healthier choices because ultra-processed foods are heavily marketed, inexpensive, convenient, and often designed to be addictive. A nutrition expert can help patients understand food labels, recognize hidden sugars and additives, and develop healthier eating habits.
At the community level, nutritionists can design healthy menus for schools, hospitals, and community programs and help public health organizations design policies and educational campaigns that promote healthier meal choices.
Nutrition professionals can also help combat misinformation. Social media is filled with conflicting diet advice, exaggerated health claims, and confusing trends that can leave people overwhelmed. A strong background in nutrition science allows professionals to evaluate research critically and provide evidence-based recommendations to their constituency.
Earning a Master's in Human Nutrition from Columbia's IHN will equip you with the necessary knowledge and expertise to help people cut through the noise. By encouraging people to make informed choices and advocating for healthier food environments, nutrition professionals can contribute to improving overall public health. Interested in exploring the opportunities in the field of nutrition further? Sign up for a webinar here.