Processed food, especially the ultra‑processed variety, is a modern dietary hazard that most patients—and even many clinicians—cannot easily identify. Dr. Jason Schuster breaks down the NOVA system to show how these foods accelerate disease by overwhelming the body with alien chemicals, making a clear case for cleaner eating.
NOVA Classification Overview
Dr. Jason Schuster explains the widely‑cited NOVA system, which sorts foods into four groups. Group 1 is unprocessed or minimally processed foods; Group 2 includes oils, fats, salt and added sugar; Group 3 is processed foods; Group 4 is ultra‑processed foods.
- Group 1 – unprocessed/minimally processed (e.g., fresh fruits, vegetables, meats)
- Group 2 – oils, fats, salt, added sugar (limit added sugar; it's toxic)
- Group 3 – processed foods (canned beans, beef jerky; some are acceptable)
- Group 4 – ultra‑processed foods (to avoid at all costs)
How Ultra‑Processed Foods Damage Health
According to Dr. Schuster, ultra‑processed foods are “alien substances” that our bodies have not evolved to metabolize. They rapidly contribute to heart disease and other chronic conditions by overwhelming the epigenome with toxic compounds.
- Contain synthetic additives and emulsifiers not found in nature
- Lack fiber, preventing proper sugar metabolism
- Trigger epigenetic changes linked to cardiovascular disease
Eating Recommendations
Use the NOVA groups as a quick patient tool: prioritize group 1 and 2, limit added sugar, and stay away from group 4. Whole fruit supplies fiber that mitigates sugar spikes, while fruit juice does not.
- Eat plenty of fresh produce, nuts, and lean proteins (group 1)
- Use healthy oils sparingly; avoid added sugar (group 2)
- Choose canned beans over highly processed snacks (group 3)
- Eliminate ultra‑processed items such as sugary drinks, snack cakes, and processed meats (group 4)
“Ultra‑processed food is probably the number one leading cause of all disease and impairment in the United States.”— Dr. Jason Schuster
Dr. Schuster's short takes on this topic — tap to play.
The full nutrition coursework
Dr. Schuster's board-certified, accredited online nutrition courses — the research, the dosing, and the clinical reasoning in full.