Pulse-based vs meat-based guideline diets: biomarkers in adults aged 60+
In a crossover feeding trial, adults aged 60 and older ate a pulse-protein and a meat-protein diet, both aligned with US dietary guidelines; both improved glucose and lipid biomarkers except HDL, while the pulse diet additionally benefited visceral-to-total fat ratio and iron status. [1]
Automatic summary · not editorially reviewed
The key findings
Adults aged 60 and older ate a pulse-protein and a meat-protein diet for eight weeks each, separated by at least a two-week washout. [1]
Both diets improved glucose and lipid metabolism biomarkers except HDL, regardless of protein source. [1]
The pulse-based diet additionally benefited the visceral-to-total fat ratio and iron status. [1]
The source at a glance
- Study type / format
- Randomized controlled crossover feeding trial (abstract)
- Population / context
- Midwestern adults aged 60 years and older; 47 completed the trial.
- Summary based on
- Study abstract
- Original publication
- May 19, 2026
PRODMED1 crossover trial in Midwestern adults 60+
The PRODMED1 trial compared a pulse-protein diet (PPD) with a meat-protein diet (MPD) in Midwestern adults aged 60 years and older. Participants ate each diet for eight weeks, separated by a washout of at least two weeks. The main protein sources were 162 g/day lean pork versus 331.6 g/day pulses, contributing at least 45% of total dietary protein. Both diets were aligned with the Dietary Guidelines for Americans and matched for total iron, energy and macronutrients, but differed in heme iron and methionine.
Supporting source [1]
Both diets improved glucose and lipid markers except HDL
Forty-seven participants completed the trial (72% women; age 69.2 ± 6.6 years; BMI 28.6 ± 5.4 kg/m²). Primary outcomes were ferritin, fasting blood glucose and trimethylamine N-oxide (TMAO); secondary outcomes included inflammation, body composition, lipid-related cardiovascular risk biomarkers and circulating biogenic amines. Regardless of protein source, both diets improved biomarkers of glucose and lipid metabolism except HDL. The pulse-based diet additionally benefited the visceral-to-total fat ratio and iron status.
Supporting source [1]
Abstract-only scope of the PRODMED1 feeding trial
The authors conclude that high-quality diets aligned with the Dietary Guidelines for Americans improved cardiovascular risk factors irrespective of primary protein source, and that the pulse-based diet conferred additional benefits to visceral-to-total fat ratio and iron status. These are associations from a feeding trial, not proof of effects on lifespan. Only the abstract was reviewed; the full text was not reviewed, so details such as the exact statistical results and adverse events are not available here.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. Results are associations from a feeding trial, not evidence of lifespan effects.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
de Vargas BO, Vaezi S, Weidauer L, Sanders WM, Dey M. · europepmc.org · May 19, 2026