Starting nutrition supplements at the beginning of cancer treatment works better than waiting. In a 2026 randomized trial of 216 patients with nasopharyngeal cancer, published in JAMA Oncology, early supplementation reduced the share losing more than 5% of body weight from 80.7% to 65.4%. According to research reviewed by Gram, this weight benefit is the clearest finding.
Losing weight during cancer treatment can make it harder to finish therapy and recover. A new randomized clinical trial in JAMA Oncology tested whether starting oral nutritional supplements (drinks and snacks that add calories and protein) at the beginning of chemoradiotherapy works better than waiting until eating declines. The trial included 216 adults with nasopharyngeal cancer, a cancer of the upper throat, across six hospitals in China. Patients who started supplements early were less likely to lose more than 5% of their body weight, and they had fewer severe mouth sores. According to research reviewed by Gram, the weight benefit was clear, while the cost findings were preliminary. Patients should always talk with their oncology team before changing their diet during treatment.
Key Statistics
A 2026 randomized clinical trial of 216 patients with nasopharyngeal cancer, published in JAMA Oncology, found that 65.4% of those who started oral nutritional supplements early lost more than 5% of their body weight during radiation and chemotherapy, compared with 80.7% of those on routine supplementation.
In the same 2026 JAMA Oncology trial, severe radiation-related mouth sores (grade 3 or higher) affected 14.0% of patients who started supplements early, compared with 26.6% of patients on routine supplementation, although this result was exploratory.
The 2026 trial reported a relative risk of 0.81 for more than 5% weight loss with early oral nutritional supplementation (95% confidence interval 0.68 to 0.96), and an intention-to-treat analysis of all 236 randomized patients produced a similar estimate of 0.78.
The Quick Take
- What they studied: Does starting nutrition supplements at the very beginning of cancer treatment protect against weight loss better than waiting until a patient’s eating drops?
- Who participated: 216 adults aged 18 to 70 with newly diagnosed nasopharyngeal cancer, a cancer in the area behind the nose and throat, who were receiving radiation combined with chemotherapy. About 78% were men, and the average age was about 47. The trial began with 242 people screened and 236 randomized, across six hospitals in China.
- Key finding: About 65% of patients who started supplements early lost more than 5% of their body weight, compared with about 81% of patients who started supplements only after their eating declined. That is roughly 15 percentage points fewer patients losing significant weight, and the difference was statistically significant, meaning it is unlikely to be due to chance.
- What it means for you: For people starting radiation and chemotherapy for this type of cancer, early nutrition support appears to help protect body weight. Anyone in treatment should ask their care team whether an early nutrition plan is right for them, since needs vary by person and by treatment.
The Research Details
This was a randomized clinical trial, which means participants were placed into groups by chance. This is the strongest common way to test whether one approach causes a difference, because it helps balance out other factors that could affect the results. Researchers at six tertiary hospitals in China enrolled patients between July 2021 and May 2025. Everyone had newly diagnosed cancer that was stage II to IVA and was scheduled for combined radiation and chemotherapy.
Participants were split evenly into two groups. One group started oral nutritional supplements at the beginning of treatment. The other group received the same supplements only after their nutritional status declined, based on criteria set before the study began. Because the study was open-label, both patients and staff knew which group each person was in, although the main measurements were recorded in a standard way.
The main measure was how many patients lost more than 5% of their body weight from the start of treatment to the end of radiation. The researchers also tracked a nutrition assessment score, mouth sores caused by radiation, quality of life, interruptions to radiation, and costs. Results were analyzed using a group of patients who actually received the assigned treatment, along with an analysis that included everyone randomized, and both gave similar answers.
Random assignment is important here because patients who eat more or feel better might otherwise look like they benefit more from supplements for unrelated reasons. By dividing people by chance, the trial makes it more reasonable to attribute the weight difference to the timing of supplements. Measuring weight loss against a clear threshold also gives doctors a practical yardstick they can use in everyday care.
The trial was published in a respected peer-reviewed oncology journal and was registered in advance on ClinicalTrials.gov (NCT04823468), which reduces the risk of changing the goals after seeing the data. The sample of 216 analyzed patients is reasonable for this type of trial but is still modest in size. Because the study was open-label, staff and patients knew who received early supplements, which can influence how symptoms are reported. Findings come from six hospitals in one country, so results may differ in other healthcare settings.
What the Results Show
The main result was clear. In the group that started supplements early, 70 of 107 patients (65.4%) lost more than 5% of their body weight. In the group that started supplements only after eating declined, 88 of 109 patients (80.7%) reached that level of loss. The relative risk was 0.81, meaning early supplementation was associated with about 19% lower odds of this kind of weight loss. The confidence interval of 0.68 to 0.96 suggests the true effect is likely a real reduction rather than random noise.
An analysis that included all 236 randomized patients, including those who did not follow their assigned plan, gave a similar result. This consistency makes it less likely that the finding was caused by patients dropping out or switching groups. The researchers therefore treated the early supplementation benefit for weight as fairly robust within this trial.
Weight loss is important in this group because cancer and its treatment often reduce appetite, making it hard to eat enough. Maintaining weight may help patients tolerate treatment, reduce the chance that treatment must be paused, and support recovery. The study did not directly measure whether early support improved survival, so these benefits are inferred rather than proven here.
Severe radiation-related mouth sores, known in medical terms as grade 3 or higher radiation-induced oral mucositis, were less common in the early supplementation group. This complication affects the lining of the mouth and throat and can make eating and drinking very painful. Fourteen percent of early-start patients (15 people) had these severe sores, compared with 26.6% (29 people) in the routine group, with a relative risk of 0.53. Because this was an exploratory outcome, the researchers describe it as a possible benefit that needs confirmation in future studies.
The cost analysis suggested a possibly favorable short-term pattern. Best-case total costs were about $9,561 for early supplementation and about $9,685 for routine supplementation. Quality-adjusted life-years, a measure combining length and quality of life, were slightly higher with early support (0.1144 vs 0.1132). These numbers are small and come from best-case modeling, so they should be viewed as preliminary rather than definitive.
The nutrition assessment scores and quality of life measures are also part of the full report, and they help show how patients felt during treatment. Taken together, the pattern suggests that early support may help patients feel more in control of their nutrition, though the exact size of quality-of-life changes should be read in the context of the full paper.
Medical guidelines for patients with head and neck cancer have long recommended careful nutrition monitoring during radiation, and many clinics already provide supplements. What has been less clear is when to start them. This trial adds direct evidence that starting at the beginning of treatment can prevent more weight loss than waiting for a decline. It fits with a broader pattern in cancer nutrition research showing that early, proactive support tends to work better than reacting after problems appear.
The trial was conducted in China at six hospitals, so results may not apply equally to patients in other countries, health systems, or cancer types. Because the study was open-label, patients and staff knew who was receiving early supplements, which can affect how people report side effects and how care is delivered. The study looked at weight over the course of radiation and chemotherapy, not long-term health, survival, or whether weight was regained afterward. Some secondary findings, especially the mouth sore and cost results, were exploratory, meaning they were not the main goal and may not hold up in larger studies. The cost data also relied on best-case estimates.
The Bottom Line
Research shows that starting oral nutritional supplements at the beginning of radiation and chemotherapy reduced the share of patients losing more than 5% of their body weight, with a confidence level that is fairly high for this specific outcome in this specific setting. The evidence for fewer severe mouth sores is promising but more tentative. The cost findings are preliminary and should not be treated as settled. Patients should discuss timing and type of supplements with their oncology dietitian or care team, since the right plan depends on individual needs.
This research is most relevant to adults with nasopharyngeal cancer or other head and neck cancers who are about to start radiation combined with chemotherapy, along with their families and the clinicians who support them. Hospital nutrition teams and oncology staff may also find it useful for planning care. People who are not in cancer treatment, or whose cancer type or treatment is very different, should not assume these results apply to them without medical advice.
Based on this trial, weight changes were measured from the start of treatment through the end of radiation, which typically lasts several weeks. Patients in the early group were less likely to reach the 5% weight loss mark by that point. Benefits for mouth sores and quality of life would also be expected during this treatment period. Long-term effects on recovery, survival, and weight regain after treatment were not measured in this study and remain unknown.
Frequently Asked Questions
Does starting nutrition shakes early during cancer treatment help prevent weight loss?
Research shows that starting oral nutritional supplements at the beginning of chemoradiotherapy reduced weight loss. In a 2026 JAMA Oncology trial of 216 patients, 65.4% of the early group lost more than 5% of body weight, compared with 80.7% of the routine group.
What is the best time to start nutritional supplements during radiation and chemotherapy?
A 2026 randomized trial suggests starting supplements at the beginning of treatment, rather than waiting for eating to decline, works better for keeping weight. Patients should confirm timing with their oncology team, since individual needs vary.
Can nutrition supplements reduce mouth sores from head and neck radiation?
A 2026 trial found that severe radiation mouth sores occurred in 14.0% of patients who started supplements early, versus 26.6% on routine plans. This result was exploratory, so researchers consider it promising but not yet confirmed by larger studies.
Is early oral nutrition support worth the cost for nasopharyngeal cancer patients?
Early supplementation showed a potentially favorable short-term cost pattern, with best-case costs of about $9,561 versus $9,685 in a 2026 trial. These estimates are preliminary, and researchers say more economic studies are needed before drawing firm conclusions.
Want to Apply This Research?
- Record body weight once a week at the same time of day, using the same scale, and note the starting weight at the beginning of treatment. Also log daily supplement servings taken and the percentage of usual meals eaten. Flag any week when weight has dropped by 3% or more so the care team can be contacted early.
- Set a daily reminder to take prescribed nutrition drinks or snacks at spaced times, such as mid-morning, afternoon, and evening, rather than waiting until hunger or nausea makes eating hard. Keep a simple checklist of supplements, and share any trouble swallowing or mouth pain with your care team right away.
- Keep a running chart of weekly weight, supplement use, and mouth comfort across the full treatment period, then continue weight checks for several months after treatment ends. Share the trend with your oncology dietitian at each visit, and use the data to decide with your doctor whether to adjust your nutrition plan.
This article summarizes a single randomized clinical trial for general information only and does not replace medical advice. Nutrition needs during cancer treatment vary widely, and changes to diet or supplement use should be made only with your oncology team or a registered dietitian. The study was conducted in China and may not apply to every patient or setting.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.