A 2026 prospective cohort study of 146 heart failure patients found that those eating low amounts of plant protein had a 1.93 times higher risk of death or hospitalization compared to those eating high amounts of plant protein over one year. According to Gram Research analysis, this suggests plant-based proteins like beans, lentils, and nuts may help heart failure patients live longer and avoid hospital stays, though animal protein intake alone showed no significant protective effect.
A new study of 146 heart failure patients in Japan found that eating more plant-based protein was linked to better survival and fewer hospital visits over one year. Patients who ate less plant protein had nearly twice the risk of death or hospitalization compared to those eating more plant protein. The research suggests that the type of protein matters for heart health—plant sources like beans, lentils, and nuts may be more protective than animal sources like meat and dairy for people with heart failure.
Key Statistics
A 2026 prospective cohort study of 146 heart failure patients in Japan found that low plant protein intake was associated with a 1.93 times higher risk of all-cause death and hospitalization compared to high plant protein intake over one year.
Among 146 heart failure patients followed for one year, 6 died and 28 were hospitalized, with those consuming less than 6% of daily calories from plant protein showing significantly worse outcomes than those consuming more.
A 2026 study of heart failure patients found that the combination of high animal protein and low plant protein intake was associated with increased mortality and hospitalization risk, suggesting plant protein may be more protective than animal protein for this population.
The Quick Take
- What they studied: Whether the amount and type of protein people eat (from animals versus plants) affects how long heart failure patients live and how often they need hospital care.
- Who participated: 146 patients with chronic heart failure treated at 10 hospitals in Japan between 2012 and 2014. Researchers tracked their eating habits and health outcomes for one year.
- Key finding: Patients eating low amounts of plant protein were 1.93 times more likely to die or be hospitalized compared to those eating high amounts of plant protein. Animal protein intake didn’t show the same protective effect.
- What it means for you: If you have heart failure, eating more plant-based proteins like beans, lentils, tofu, and nuts may help you stay healthier and out of the hospital. However, this is one study in a specific population, so talk to your doctor about your individual diet needs.
The Research Details
This was a prospective cohort study, meaning researchers followed the same group of people forward in time to see what happened. All 146 participants had chronic heart failure and were treated at Japanese hospitals. At the start of the study, researchers asked patients detailed questions about what they ate using a validated food questionnaire. The researchers then tracked these patients for one year to see who died or needed hospitalization.
The researchers divided patients into two groups based on how much plant and animal protein they ate as a percentage of their total daily calories. For plant protein, the cutoff was 6% of daily calories, and for animal protein it was 10.3%. This allowed them to compare outcomes between high and low protein consumers.
This study design is important because it looks at real patients with heart failure over time, rather than just testing protein in a lab. By collecting detailed dietary information at the beginning and then following patients, researchers could see if eating patterns predicted health outcomes. This type of study is stronger than simply asking people to remember what they ate years ago.
This study has some strengths: it used a validated food questionnaire, followed patients for a full year, and adjusted results for other health factors that might affect outcomes. However, the sample size of 146 patients is relatively small, and all participants were from Japan, so results may not apply equally to other populations. The study also relied on patients’ memory of what they ate, which can be imperfect.
What the Results Show
During the one-year follow-up period, 6 patients died and 28 were hospitalized (34 total adverse events out of 146 patients). When researchers compared patients eating low plant protein to those eating high plant protein, the low plant protein group had a 1.93 times higher risk of death or hospitalization. This means if you eat less plant protein, your chances of these bad outcomes nearly double.
Interestingly, the amount of animal protein people ate didn’t show a significant protective or harmful effect on its own. However, when researchers looked at the combination of high animal protein and low plant protein intake together, this combination was associated with worse outcomes. This suggests that what matters most is getting enough plant protein, and possibly that plant protein may be more beneficial than animal protein for heart failure patients.
The study specifically looked at two types of outcomes: all-cause death and hospitalization (any reason), and cardiac death and heart failure-specific hospitalization. Plant protein intake showed a protective effect for both types of outcomes, suggesting the benefit wasn’t limited to just one category of health problems.
According to Gram Research analysis, earlier studies in people without heart failure showed that plant protein had health benefits, but this is one of the first studies to specifically examine this question in heart failure patients. The findings align with growing evidence that plant-based diets may benefit heart health, though the specific mechanisms in heart failure patients need more research.
The study followed patients for only one year, so we don’t know about longer-term effects. With only 146 patients and 34 adverse events, the results have some uncertainty. The study was conducted in Japan, where dietary patterns differ from other countries, so these findings may not apply equally everywhere. The researchers relied on patients’ self-reported diet, which can be inaccurate. Finally, this observational study can show associations but cannot prove that plant protein directly causes better outcomes—other unmeasured factors could explain the relationship.
The Bottom Line
For heart failure patients: Consider increasing plant-based protein sources like beans, lentils, chickpeas, tofu, nuts, and seeds. Aim for at least 6% of your daily calories from plant protein (roughly 15-20 grams per day for a 2,000-calorie diet). This recommendation has moderate confidence based on this single study; stronger evidence would come from larger, longer studies. Always consult your cardiologist before making major dietary changes, as individual needs vary.
This research is most relevant to people with diagnosed chronic heart failure. If you have heart failure, these findings suggest plant protein may be beneficial. People without heart failure should also note that plant-based proteins are generally healthy, though this study doesn’t directly address them. Those with kidney disease or other conditions affecting protein metabolism should discuss dietary changes with their doctor.
The study tracked outcomes over one year, so benefits may take weeks to months to appear. Don’t expect immediate changes, but consistent dietary improvements over months may reduce hospitalization risk and improve survival rates.
Frequently Asked Questions
Is plant protein better than meat protein for heart failure patients?
Research shows plant protein intake was associated with lower death and hospitalization risk in heart failure patients, while animal protein alone showed no significant protective effect. The combination of high animal and low plant protein was linked to worse outcomes, suggesting plant sources may be more beneficial.
How much plant protein should heart failure patients eat daily?
This study used 6% of daily calories as a protective threshold. For a 2,000-calorie diet, that’s roughly 30 grams daily, though individual needs vary. Consult your cardiologist about your specific protein requirements based on your kidney function and overall health.
What are good plant protein sources for people with heart disease?
Beans, lentils, chickpeas, tofu, tempeh, nuts, seeds, and whole grains provide plant protein. These foods also contain fiber and beneficial compounds that support heart health. Start with small portions and increase gradually to avoid digestive discomfort.
Can I still eat meat if I have heart failure?
This study didn’t show that meat protein was harmful on its own, but plant protein appeared more protective. Many heart failure diets include lean meats in moderation. Work with your cardiologist and dietitian to balance protein sources based on your individual condition and sodium restrictions.
How quickly will changing my protein intake help my heart failure?
This study tracked outcomes over one year, suggesting benefits develop gradually. Consistent dietary changes over weeks to months may reduce hospitalization risk, but don’t expect immediate improvements. Monitor your symptoms and work closely with your healthcare team.
Want to Apply This Research?
- Log daily plant protein sources and track grams consumed. Set a goal of 15-20 grams of plant protein daily and monitor weekly totals. Record any hospitalizations or health events to correlate with dietary patterns over time.
- Add one plant-based protein source to each meal: beans in breakfast burritos, lentil soup at lunch, and tofu stir-fry at dinner. Use the app to discover new plant protein recipes and set reminders to meal prep plant-based proteins weekly.
- Track plant protein intake weekly and correlate with energy levels, hospital visits, and doctor check-ups. Create a dashboard showing 4-week rolling averages of plant protein consumption alongside health markers like weight and blood pressure readings.
This research describes associations between plant protein intake and health outcomes in heart failure patients but does not prove cause-and-effect relationships. Individual nutritional needs vary significantly based on kidney function, medications, and other health conditions. Anyone with heart failure should consult their cardiologist or registered dietitian before making major dietary changes. This article is for educational purposes and should not replace professional medical advice. The study involved 146 Japanese patients followed for one year; results may not apply equally to all populations.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.