# Ultra-processed Food and Excess Energy Intake: research update

Dated 5 October 2026. Local prepublication addendum; archived grade unchanged.

Controlled diets can change intake and weight, while texture and eating rate produce effects within processing categories. Establishing a category-wide effect independent of the properties consumed requires stronger separation of composition, physical structure and proposed mechanisms.

## Research timeline

Electronic year is used where recorded; issue year is retained in each source card. The chronology is selected, not exhaustive, and does not establish priority or causation.

| Year | Primary study | Design and finding | Inference limit |
|---|---|---|---|
| 2019 | [Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake.](https://pubmed.ncbi.nlm.nih.gov/31105044/) | Inpatient ad libitum randomized crossover. The ultra-processed diet increased intake and weight relative to its comparator. | Matched offered nutrients do not guarantee matched consumed composition, nonbeverage density or eating rate; corrections retained. |
| 2022 | [Texture-based differences in eating rate influence energy intake for minimally processed and ultra-processed meals.](https://pubmed.ncbi.nlm.nih.gov/35285882/) | Acute processing-by-texture crossover. Harder meals slowed intake and reduced energy intake across processing levels. | Acute lunch and daily intake measures do not demonstrate long-term adiposity mediation. |
| 2023 | [Speed limits: the effects of industrial food processing and food texture on daily energy intake and eating behaviour in healthy adults.](https://pubmed.ncbi.nlm.nih.gov/37452167/) | Daily processing-by-texture feeding. Hard texture reduced daily intake; processing-category contrasts were context-dependent. | Small preliminary sample and property differences bound an independent category inference. |
| 2024 | [Ultra-processed foods cause weight gain and increased energy intake associated with reduced chewing frequency: A randomized, open-label, crossover study.](https://pubmed.ncbi.nlm.nih.gov/39267249/) | Short open-label randomized crossover. The tested ultra-processed diet increased intake/weight and reduced chewing per calorie. | Short exposure and simultaneous food-property changes do not isolate chewing as mediator. |
| 2025 | [Brain dopamine responses to ultra-processed milkshakes are highly variable and not significantly related to adiposity in humans.](https://pubmed.ncbi.nlm.nih.gov/40043691/) | Human post-ingestive dopamine PET. A milkshake produced no significant average striatal dopamine response by the measured method. | A single food and measurement sensitivity do not exclude every reward mechanism. |
| 2025 | [Ultraprocessed or minimally processed diets following healthy dietary guidelines on weight and cardiometabolic health: a randomized, crossover trial.](https://pubmed.ncbi.nlm.nih.gov/40760353/) | Healthy-guideline community crossover. Both diets reduced weight; the minimally processed diet produced greater loss. | This is a relative difference between defined diets, not a claim that all ultra-processed diets cause weight gain. |
| 2025 | [Eating rate has sustained effects on energy intake from ultraprocessed diets: a 2-week ad libitum dietary randomized controlled crossover trial.](https://pubmed.ncbi.nlm.nih.gov/41314613/) | Two-week slow/fast ultra-processed crossover. Slower eating reduced intake within ultra-processed diets; body weight did not differ. | No minimally processed comparator; intake effects and weight outcomes must remain distinct. |
| 2026 | [Effects of Ultra-Processed Meals with Differing Energy Density on Postprandial Glyco-Insulinemic and Appetite-Related Hormonal Responses: A Randomized Crossover Trial.](https://pubmed.ncbi.nlm.nih.gov/42588167/) | Processing-by-density hormonal analysis. Acute insulin differences were reported without a density interaction. | Secondary exploratory hormonal findings do not establish the appetite/weight mediator. |
| 2026 | [Effect of ultra-processed-rich versus ultra-processed-free preload meals at high and low energy density on ad libitum energy intake: a randomized crossover trial.](https://pubmed.ncbi.nlm.nih.gov/42633852/) | Processing-by-density preload crossover. Processing did not affect subsequent intake or short-term satiety in the tested design. | Acute preload results do not refute every longer whole-diet effect; shares a registry with source 10. |

## Research gaps

### G1: Does category membership predict effects after food properties are controlled?

Evidence anchors: [P31105044](https://pubmed.ncbi.nlm.nih.gov/31105044/), [P35285882](https://pubmed.ncbi.nlm.nih.gov/35285882/), [P37452167](https://pubmed.ncbi.nlm.nih.gov/37452167/), [P40760353](https://pubmed.ncbi.nlm.nih.gov/40760353/).

Competing explanation: Eating rate, density or nutrient selection may account for a diet contrast.

Discriminating test and controls: Factorial processing-by-texture designs with measured consumed density/composition, palatability and beverage calories; prespecified category interaction.

### G2: Does slower eating reduce sustained adiposity?

Evidence anchors: [P37452167](https://pubmed.ncbi.nlm.nih.gov/37452167/), [P39267249](https://pubmed.ncbi.nlm.nih.gov/39267249/), [P41314613](https://pubmed.ncbi.nlm.nih.gov/41314613/).

Competing explanation: Intake reduction may be compensated later or be too brief to change weight.

Discriminating test and controls: Longer randomized texture interventions within and across processing categories, with total intake, fat mass and compensatory snacking measured.

### G3: Do additives or matrix changes have an independent causal effect?

Evidence anchors: [P35285882](https://pubmed.ncbi.nlm.nih.gov/35285882/), [P37452167](https://pubmed.ncbi.nlm.nih.gov/37452167/), [P42633852](https://pubmed.ncbi.nlm.nih.gov/42633852/).

Competing explanation: Additives may mark other properties; acute satiety may differ from chronic metabolic effects.

Discriminating test and controls: Matched-component/additive and matrix factorial trials with validated exposure, intake and longer outcomes; the current search does not establish absence of all such studies.

### G4: Which physiological signal actually mediates intake?

Evidence anchors: [P40043691](https://pubmed.ncbi.nlm.nih.gov/40043691/), [P42588167](https://pubmed.ncbi.nlm.nih.gov/42588167/), [P42633852](https://pubmed.ncbi.nlm.nih.gov/42633852/), [P31105044](https://pubmed.ncbi.nlm.nih.gov/31105044/).

Competing explanation: Measured dopamine or insulin may be weak, downstream or unrelated to the observed diet effect.

Discriminating test and controls: Repeated appetite/reward measurements within randomized feeding plus selective model perturbation; separate target engagement, correlation and formal mediation.

## Methods and access

Case-specific Consensus records assisted gap discovery, chronology and targeted paper questions. Shared template wording about an amyloid-specific Deep follow-up is not evidence of a Deep run for this topic; the dated source records establish the actual use and access limits. Primary identifiers, selected abstract passages, correction notices and available primary-body passages were cross-checked. Generated absence cells, duplicate milestones and unsupported access claims were rejected.

This focused addendum does not establish 50–70 complete primary Methods/Results examinations per review. Baseline reading receipts and scores retain their original scope.

Checked timeline sources: 9; selected full-text checks: 1; abstract-excerpt checks: 8; metadata-only historical anchors: 0. Complete papers examined in this update: 0.

Historical scorecards declare schema 5.4. This enrichment uses HSEF v5.3 causal distinctions without retrospectively relabelling or rescoring those files.

Targeted paper-check scope: Results Par35/38: a daily texture-associated intake effect and meal-specific palatability differences. No consumed-density matching was assumed from as-served menus.

Editorial correction/limit: A generated Consensus timeline caption incorrectly referred to CRISPR. It was discarded. Forde has a 2026 issue date and 2025 electronic date; hormonal and preload reports sharing a registry are not independent cohorts.