Are All Processed Foods Really Bad for You? | David Allison, Ph.D.

The distinction between processed and ultra-processed foods is largely a human construct, as all foods are chemical compositions whose effects depend on their molecular structure, not their origin or degree of processing.

• Most foods are processed, and the 'ultra-processed' definition is inconsistent, categorizing widely diverse items together.

• The health effects of foods depend on their molecular structure, not whether they are 'natural' or 'processed.'

• All food consists of chemicals, and consumer apprehension about complex ingredient lists is often based on misunderstanding, not actual chemical harm.

Most foods consumed are processed, but the definition of 'ultra-processed' lacks clarity and can categorize vastly different items together. While there's concern that ultra-processed foods are engineered to be hyper-palatable and calorie-dense, leading to overconsumption, focusing on this category as a blanket health heuristic may be overly simplistic. The actual health effects of foods are determined by their molecular structure, not by whether they are 'natural' or 'processed'.

Defining Processed Foods

• 00:00:00 Almost everything we eat is processed, including dried fruit, cut fruit, wine, cheese, and homogenized milk, illustrating that processing involves various steps beyond a raw state. The concept of 'ultra-processed' food is often vaguely defined, with criteria typically including the number and types of processing steps and ingredients, often associated with packaged goods, but lacking a precise, agreed-upon definition.

• 00:02:46 The argument against ultra-processed foods stems from their design to be highly palatable and calorie-dense, which can lead to overeating and adverse health outcomes. However, the lack of a consistent definition for 'ultra-processed' makes it difficult to apply universally, as it can lump together diverse items like meal replacement shakes and sugary drinks, which have very different nutritional profiles and purposes.

The 'Natural' Fallacy

• 00:05:04 The intellectual core of understanding food effects lies in recognizing that substances' impacts on the body depend on their molecular structure, not their origin or 'ancestry.' This means whether a molecule is extracted from a natural source or synthesized in a laboratory, its biological effect is determined by its chemical makeup, not how it was produced or where it came from.

• 00:06:34 There is a widespread misconception that 'natural' foods are inherently healthier or safer than 'processed' ones. This ignores that many 'natural' substances, like hemlock, are poisons and that many common foods today, such as modern apples, oranges, and livestock, have been significantly altered through breeding, rendering them far from their ancient 'natural' forms.

Ingredient Lists & Chemicals

• 00:08:26 The concern that long ingredient lists with unpronounceable names in ultra-processed foods indicate hidden dangers is largely unfounded. While consumers may not recognize chemical names, all food, including an apple, is composed of chemicals, many of which would sound 'scary' if listed individually.

• 00:09:44 The notion of a 'chemical-free' food is a fallacy, as all matter, including our bodies, is made of chemicals. The purpose of eating is to introduce chemicals into the body to replenish those lost during life processes, challenging the intuitive but incorrect belief that foods with fewer, easily recognizable ingredients are automatically safer or healthier at a chemical level.

Utility of Categories

• 00:03:47 When creating food categories like 'ultra-processed,' it is crucial to consider their intended utility: are they for simple heuristics to guide public behavior, or for determining the precise physiological effects of foods? While telling people to avoid ultra-processed foods might offer a short-term behavioral benefit, it does not accurately describe the inherent effects of the foods themselves.

• 00:12:30 The categories of food, such as 'processed' and 'ultra-processed,' are artificial human constructs. These categories should be designed to be meaningful and useful for specific goals, rather than perpetuating misleading distinctions based on origin or perceived 'naturalness' that lack scientific basis in molecular function.