Researchers studied 1,825 people on dialysis to understand why they feel so sick and whether these symptoms predict serious health problems. They found that appetite loss, nerve problems, and trouble following diet rules were the biggest reasons patients felt bad. While symptoms were connected to worse health outcomes like hospitalizations and death, the symptoms alone weren’t strong enough to predict who would get sicker. The good news? Helping patients eat better might improve how they feel day-to-day, even if it doesn’t change the big health predictions.
The Quick Take
- What they studied: What makes dialysis patients feel sick and whether feeling sick tells us who will have serious health problems or die
- Who participated: 1,825 people receiving hemodialysis (a treatment that cleans the blood when kidneys don’t work) who answered questions about how they felt
- Key finding: Appetite loss, nerve problems, and difficulty following diet rules were the main reasons patients felt bad. Patients with more symptoms had higher risks of hospitalization and death, but symptoms alone weren’t reliable enough to predict who would get sicker
- What it means for you: If you’re on dialysis, paying attention to your appetite and diet may help you feel better and possibly improve your health. However, symptoms shouldn’t be the only thing doctors watch—they need to look at other health factors too
The Research Details
Researchers looked at information from 1,825 dialysis patients who filled out questionnaires about their symptoms over time. They used advanced computer programs (machine learning) to figure out which health factors were most connected to feeling sick. Then they used statistical tests to see if patients who felt worse had worse health outcomes like hospitalizations or death.
The study used data from the HEMO trial, which is a large, well-known research project that has been tracking dialysis patients for many years. This gave the researchers a lot of detailed health information to work with, including what patients ate, their medical history, and their symptoms.
The researchers looked at three main questions: What causes symptoms? Do symptoms predict bad health outcomes? And can knowing about symptoms help doctors predict who will get sicker better than they already can?
This research approach is important because dialysis patients often feel terrible—with fatigue, nausea, and appetite loss—but doctors don’t always take these symptoms seriously. By studying a large group of patients over time, researchers could see which symptoms matter most and whether they actually predict serious problems. This helps doctors know whether to focus on treating symptoms to improve quality of life, or whether other health measurements are more important for predicting outcomes.
This study is fairly reliable because it included a large number of patients (1,825) and used data collected over time, not just a single snapshot. The researchers used advanced computer analysis to find patterns. However, the study was done on people already in a research program, so the results might not apply exactly to all dialysis patients everywhere. The study also couldn’t prove that symptoms directly cause bad health outcomes—only that they’re connected.
What the Results Show
The researchers found three main things that were most connected to patients feeling sick: poor appetite, problems with the nervous system (like tingling or numbness), and difficulty following their diet. These three factors showed up as important both when they looked at the beginning of the study and when they tracked patients over time.
When they looked at health outcomes, patients with more symptoms did have worse results. For every 10-point increase on the symptom scale, the risk of death went down by 9%, the risk of heart-related hospitalizations went down by 11%, and the risk of infection-related hospitalizations went down by 9%. (The way these numbers are written in medical studies can be confusing—a lower hazard ratio actually means higher risk.)
However, when the researchers tested whether knowing about symptoms helped doctors predict who would get sicker, the answer was mostly no. Adding symptom information to the computer models didn’t make the predictions much better. This means that while symptoms are connected to bad outcomes, they don’t add much new information beyond what doctors already know from other health measurements.
The study found that eating habits and previous health problems were the strongest connections to symptom burden. Patients who had trouble with their appetite or couldn’t follow their diet rules felt the worst. This suggests that nutrition and eating are really important for how dialysis patients feel. The researchers also found that symptoms were connected to three different serious outcomes—death, heart problems, and infections—showing that feeling bad is linked to overall health, not just one specific problem.
Previous research has shown that dialysis patients often have lots of symptoms and that these symptoms hurt their quality of life. This study confirms that finding and goes further by showing which specific symptoms matter most (appetite and diet-related issues). It also adds to what we know by showing that while symptoms are connected to bad health outcomes, they’re not as useful as other measurements for predicting who will get sicker. This is important because it tells doctors not to rely only on how patients feel when making predictions about health risks.
The study only looked at people already in a research program, so the results might not apply to all dialysis patients. The researchers couldn’t prove that symptoms directly cause bad health outcomes—only that they’re connected. The study also didn’t look at whether treating symptoms would actually improve health outcomes. Additionally, the computer models used were complex, and some of the findings might not work the same way in different groups of patients.
The Bottom Line
Dialysis patients should work with their doctors to manage appetite loss and follow their diet as closely as possible, as these seem most connected to feeling better (moderate confidence). Doctors should continue monitoring symptoms as part of patient care to improve quality of life, but shouldn’t rely only on symptoms to predict serious health problems (moderate confidence). Healthcare teams should pay special attention to patients with poor appetite and diet difficulties, as these may need extra support (moderate confidence).
This research is most important for people on hemodialysis and their doctors. It’s also relevant for kidney disease specialists and nurses who work with dialysis patients. If you’re on dialysis and struggling with appetite or diet, this suggests your doctors should take those problems seriously. However, if you’re not on dialysis, this research doesn’t directly apply to you.
Improvements in how you feel might happen over weeks to months if you work on managing your appetite and diet better. However, this research doesn’t tell us exactly how long it takes to see benefits. The connection between symptoms and serious health problems like hospitalization happens over months to years, so it’s important to focus on long-term management rather than expecting quick fixes.
Want to Apply This Research?
- Track your appetite level daily on a scale of 1-10 and note what you ate each day. Also track any nerve-related symptoms like tingling, numbness, or weakness. This gives you and your doctor a clear picture of your biggest symptom challenges.
- Use the app to set daily diet goals based on your doctor’s recommendations and get reminders to eat at scheduled times. If appetite is low, the app could suggest smaller, more frequent meals or foods that are easier to eat. Track which foods make you feel better or worse.
- Review your symptom and diet patterns weekly with the app to spot trends. Share monthly summaries with your dialysis care team so they can adjust your treatment plan if needed. Over time, this helps you and your doctors see whether managing diet and appetite is helping you feel better.
This research is for educational purposes and should not replace medical advice from your healthcare team. If you’re on dialysis, always talk to your nephrologist (kidney doctor) or dialysis care team before making changes to your diet, medications, or treatment plan. Symptoms can indicate serious health problems that need professional evaluation. This study shows connections between symptoms and health outcomes, but doesn’t prove that treating symptoms will change your health outcomes. Everyone’s situation is different, and what works for one person may not work for another.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.