Clinical trials
Diet clinical trials
Below are recruiting diet clinical trials, each written for real people, not researchers. We’re tracking 657 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT05666154Recruiting
Testing a specific diet using a special camera for stomach symptoms
This study tests whether a tailored diet can improve symptoms in people with functional dyspepsia (stomach discomfort without a clear physical cause). It also uses a special in-hospital camera exam to look at the stomach lining and understand how the diet affects you.
LeuvenAges 18–70 - NCT07117903Recruiting
Ketogenic diet follow-up study in Shanghai
This study follows up with people who completed the first Zhongshan Ketogenic Diet Study in 2025. It looks at the long-term effects of the diet. You may be eligible if you live in Shanghai and took part in the earlier study.
Shanghai, Shanghai MunicipalityAges 18–60 - NCT07189676Recruiting
Healthy eating study for adults with metabolic issues
This study tests how eating sustainably can improve heart and metabolic health. It looks at whether a diet with more plant-based foods and less red meat can help people with conditions like high blood pressure or prediabetes.
Copenhagen, CopenhagenAges 45–70 - NCT07672691Recruiting
How diet affects gut health and inflammation
This study looks at how different types of food (fats, carbs, protein) affect your gut bacteria, inflammation, and metabolism. It may help understand how diet can improve health.
KrakowAges 18–60 - NCT05615779Recruiting
Personalized fiber (B-fructan) diet for inflammatory bowel disease
This trial tests whether a tailored diet high in B-fructans can improve inflammatory bowel disease (ulcerative colitis or IBD-unclassified) in people in mild-to-moderate remission. It may help your gut and reduce bowel inflammation, and it involves colonoscopy and sample collection.
Edmonton, AlbertaAges 6–39 - NCT06949891Recruiting
Keto diet for acromegaly
This trial tests if a ketogenic (very low-carb) diet can help lower IGF-I levels in people with acromegaly who are already on stable medication. If you have acromegaly and your IGF-I levels are still above normal despite treatment, this diet might offer an additional way to manage your condition.
RotterdamAges 18 years+ - NCT07165548Recruiting
Testing a special diet for weight and health in obesity
This trial tests whether a special diet with foods that make you feel full can help people with overweight or obesity lose weight and improve their heart, metabolic, and joint health.
Pamplona, NavarreAges 18–65 - NCT06850493Recruiting
Ketogenic Diet Before Weight-Loss Surgery
This study tests whether following a ketogenic diet (a low-carb, high-fat eating plan) before weight loss surgery can improve your health and recovery. You will be asked to follow the diet for a few weeks before your scheduled Roux-en-Y gastric bypass.
Veldhoven, North BrabantAges 18–65 - NCT06538831Recruiting
Ultra-processed foods and heart health
This study looks at how eating ultra-processed foods (like packaged snacks and sugary drinks) affects heart health markers such as cholesterol and blood pressure. If you are generally healthy and have a stable weight, you may be able to join.
Québec, QuebecAges 18–75 - NCT07247487Recruiting
Diet and Heart Health in Rosario
This study looks at how different diets (vegan, vegetarian, or omnivorous) affect heart health and metabolism in Rosario. It's a good fit if you're a generally healthy adult who has been following one of these diets for at least a year.
Rosario, Santa Fe ProvinceAges 18–65 - NCT05862818Recruiting
Food timing study to see if it lowers diabetes risk
This study looks at whether changing when you eat can reduce the chance of developing diabetes. You’d need to be generally healthy and meet specific lifestyle and body-size requirements.
Boston, MassachusettsAges 18–45 - NCT06768216Recruiting
Mediterranean vs. low-fat diet for fatty liver in overweight kids
This trial compares two diets—a Mediterranean-style diet and a low-fat diet—to see which better reduces liver fat in overweight children and teens with fatty liver disease (MASLD). It aims to find a safe, effective eating plan for young people.
New Delhi, National Capital Territory of DelhiAges 8–18 - NCT07544524Recruiting
Plant-Based Diet for Kidney Disease in Asian Adults
This study tests whether eating mostly plants (with some animal products) can safely help people with moderate kidney disease. Researchers will compare this diet to a standard kidney-friendly diet and see how it affects kidney function and overall health.
SingaporeAges 21–79 - NCT06130956Recruiting
Vegan diet before knee replacement surgery study
This study compares a 2-week vegan diet to a regular diet before knee replacement surgery. It looks at how the diet affects protein turnover in the knee joint.
ArnhemAges 60–80 - NCT07540845Recruiting
Regular Diet After Colorectal Surgery
This study tests whether patients can safely eat a regular diet right after colorectal surgery (surgery to remove part of the colon or rectum), rather than waiting. Researchers want to see if this speeds up recovery and improves outcomes.
New York, New YorkAges 18 years+ - NCT03615690Recruiting
Fasting-mimicking diet test for ulcerative colitis
This study tests whether a “fasting-mimicking diet” can improve mild to moderate ulcerative colitis. You would follow the study diet plan and be monitored to see if symptoms and disease activity change.
Palo Alto, CaliforniaAges 18–70 - NCT04401605Recruiting
Fermented foods diet for ulcerative colitis symptoms
This study tests whether adding fermented foods to your diet can improve symptoms of ulcerative colitis. It also looks at people with intestinal inflammation markers to see if diet changes may help them feel better.
Palo Alto, CaliforniaAges 18 years+ - NCT04799301RecruitingPhase 1
Measure how much sugar you eat using blood and hair samples
This Phase 1 study tests whether “biomarkers” in your blood and hair can accurately measure how much sugar you consume. It may help researchers find better ways to track dietary sugar intake in future nutrition and health studies.
Phoenix, ArizonaAges 18–65 - NCT06325722Recruiting
Low fat vs. low carb diet order and body fat change
This study compares how the order of low fat versus low carb diets affects body fat changes. It may help you understand which diet sequence works best for weight loss.
Bethesda, MarylandAges 18–50 - NCT04942093Recruiting
High-protein low-calorie diet before weight-loss surgery
This trial studies whether a higher-protein, lower-calorie diet before sleeve gastrectomy (a type of weight-loss surgery) changes outcomes after surgery. You may be able to join if you’re scheduled for the operation and meet specific health and safety requirements.
DieppeAges 18–65 - NCT05165706Recruiting
Study of how obesity affects insulin resistance over time
This study follows adults over time to understand how weight and body chemistry relate to insulin resistance. It may help researchers learn why insulin resistance happens and what could prevent or improve it.
Stanford, CaliforniaAges 35–65 - NCT05708352RecruitingPhase 2
Ketogenic diet vs usual diet guidance for newly diagnosed glioblastoma
This trial tests whether a very low-carb, high-fat ketogenic diet helps people with newly diagnosed glioblastoma when combined with standard cancer treatment. You would compare this special diet guidance to the usual anti-cancer diet guidance while receiving the same standard-of-care treatments.
Los Angeles, CaliforniaAges 18 years+ - NCT06081426Recruiting
Ketogenic diet for bipolar disorder brain study
This study looks at how a ketogenic diet (very low carb, high fat) might affect brain function in people with bipolar disorder. Participants will follow the diet and have brain scans and blood tests to see how it helps mood and energy levels.
Pittsburgh, PennsylvaniaAges 18–40 - NCT06081543Recruiting
Ketogenic vs. Mixed Diet for Heart Failure
This study compares a ketogenic (low-carb, high-fat) diet to a standard mixed diet in people with heart failure. It aims to see if the ketogenic diet can improve heart function and symptoms.
Columbus, OhioAges 18–80
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Common questions
- Are there clinical trials for diet?
- Yes. Clin2 currently lists 657 recruiting diet studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a diet trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a diet trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.