Cut Ultraprocessed Foods: Weight Loss & Metabolic Benefits for Seniors

A significant reduction in the consumption of ultra-processed foods may lead to weight loss, decreased body fat, and notable metabolic improvements, particularly in older adults. Here’s the central finding of a new study published in Clinical Nutrition, as detailed in an article by Moul Dey, a Professor of Nutritional Sciences at South Dakota State University.

What the Study Examined

The research focused on individuals over the age of 65, many of whom were overweight or had metabolic risk factors such as insulin resistance or elevated cholesterol. The study aimed to determine the effects of reducing ultra-processed food intake while maintaining a balanced diet similar to what could be followed outside of a research setting.

Ultra-processed foods include packaged snacks, ready-to-eat meals, and certain processed meats. Previous research has linked high consumption of these foods to poorer health outcomes.

How the Study Was Conducted

A total of 43 people began the study, with 36 completing it. Participants followed two different diets for eight weeks each: one based on lean meat (primarily pork) and another vegetarian diet including dairy and eggs.

In both dietary plans, ultra-processed foods accounted for less than 15% of total calorie intake—a substantial decrease compared to the average American diet, where over 50% of calories come from these types of products. The diets were designed to be realistic and did not include specific instructions to lose weight, restrict calories, or change physical activity levels.

All meals and snacks were prepared and provided by the research team, prioritizing minimally processed ingredients aligned with the Dietary Guidelines for Americans.

Key Findings of the Research

During the periods with lower ultra-processed food consumption, participants spontaneously reduced their calorie intake and experienced weight loss, including reductions in total and abdominal fat. They also showed improvements in insulin sensitivity, healthier cholesterol profiles, lower markers of inflammation, and hormonal changes associated with better appetite and metabolism regulation.

These benefits were observed in both the meat-based and vegetarian diets.

The study is particularly relevant given the increasing prevalence of ultra-processed foods in the modern diet and the growing population of older adults.

What Might Happen Next

Further research could explore whether these dietary changes can prevent chronic diseases over the long term, such as type 2 diabetes or cardiovascular disease. It may also be important to determine if individuals can maintain reduced ultra-processed food intake without structured support, and to identify which specific aspects of food processing are most detrimental to health. Larger, longer-term studies will be conducted to confirm these initial findings.

Frequently Asked Questions

What are ultra-processed foods?

Ultra-processed foods are those made with industrial techniques and additives not typically used in home cooking, such as emulsifiers, flavorings, colorings, or preservatives. They include packaged snacks, ready-to-eat meals, and some processed meats.

Who participated in this study?

The study involved 43 participants over the age of 65, with 36 completing the research. Many of the participants were overweight or had metabolic risk factors like insulin resistance or high cholesterol.

Did the type of diet matter in the study results?

No, the benefits of reducing ultra-processed foods were observed in both the meat-based diet (primarily pork) and the vegetarian diet that included dairy and eggs.

Considering these findings, what changes, if any, might you make to your own diet to reduce your intake of ultra-processed foods?