Best Diets of 2026: Expert Rankings & Reviews
Our team of registered dietitians evaluated 38 popular diets across 12 evidence-based criteria — including nutrition quality, long-term sustainability, clinical evidence, cost, and real-world results. Here are the diets that earned the highest scores.
Compare All 10 Diets
Sort by score, cost, or name. Click any column header to reorder.
| Rank↑ | Diet↕ | Score↕ | Best For | Monthly Cost↕ | CTA |
|---|---|---|---|---|---|
| #1 | Mediterranean Diet | 9.2 | Overall health & longevity | $0–$100/mo | Try It → |
| #2 | DASH Diet | 8.9 | Heart health & blood pressure | $50–$150/mo | Try It → |
| #3 | Mayo Clinic Diet | 8.7 | Sustainable weight loss | $19.99/mo | Try It → |
| #4 | Noom | 8.4 | Behavior change & accountability | $70/mo | Try It → |
| #5 | WeightWatchers (WW) | 8.1 | Flexible, community-based dieting | $23/mo | Try It → |
| #6 | Mediterranean Keto | 7.9 | Weight loss with heart benefits | $0–$150/mo | Try It → |
| #7 | Intermittent Fasting (16:8) | 7.7 | Simplicity, no calorie counting | Free | Try It → |
| #8 | Plant-Based Diet | 7.5 | Environment + health | $50–$100/mo | Try It → |
| #9 | Nutrisystem | 7.2 | Convenience, pre-portioned meals | $270/mo | Try It → |
| #10 | Keto Diet | 6.8 | Rapid initial weight loss | $100–$200/mo | Try It → |
Click column headers to sort. Scores based on nutrition quality, sustainability, evidence base, and real-world results.
Full Diet Rankings & Reviews
Mediterranean Diet
The gold standard for overall health, longevity, and sustainable weight management.
Pros
- Strongest evidence base of any diet — decades of clinical research
- Reduces risk of heart disease, diabetes, and cognitive decline
- Flexible and enjoyable — no strict rules or calorie counting
Cons
- Requires cooking from scratch, which takes time
- Higher quality ingredients can increase grocery costs
- No structured program or accountability built in
DASH Diet
Clinically proven to lower blood pressure and improve cardiovascular markers.
Pros
- Endorsed by the American Heart Association and NIH
- Lowers systolic blood pressure by an average of 8–14 mmHg
- Rich in fruits, vegetables, and lean protein — naturally balanced
Cons
- May be overly restrictive on sodium for those without hypertension
- Requires careful tracking of sodium and nutrient targets
- No packaged program — requires DIY meal planning
Mayo Clinic Diet
Developed by Mayo Clinic physicians for safe, sustainable long-term weight loss.
Pros
- Developed by actual Mayo Clinic medical experts
- Focuses on habit change, not just calorie restriction
- Includes meal planning tools, food tracker, and recipes
Cons
- The app experience can feel dated compared to competitors
- Less community support than Noom or WeightWatchers
- Some users find the initial "Lose It!" phase too restrictive
Noom
Psychology-based weight loss program that targets the behaviors behind overeating.
Pros
- Addresses psychological patterns behind food choices
- Daily lessons keep users engaged and on track
- Personal coach access provides real-time accountability
Cons
- More expensive than many competitors
- Coach quality varies significantly between users
- Heavy app reliance — requires consistent engagement to see results
WeightWatchers (WW)
The most flexible commercial diet program with one of the strongest community ecosystems.
Pros
- Points system allows no foods to be off-limits
- Large, active community for accountability and support
- Budget-friendly — one of the most affordable structured programs
Cons
- Can lead to over-focus on point values rather than food quality
- Results slower compared to more structured approaches
- The program has changed significantly — longtime users may be confused
Mediterranean Keto
The best of both worlds — ketogenic fat burning with Mediterranean food quality.
Pros
- Combines keto weight loss with heart-protective Mediterranean foods
- Emphasizes healthy fats (olive oil, avocado, nuts) over processed fats
- Lower inflammation compared to traditional keto
Cons
- Difficult to maintain long-term — requires significant dietary discipline
- Expensive if relying on high-quality fish, nuts, and olive oil
- Keto adaptation period causes fatigue and brain fog for 1–2 weeks
Intermittent Fasting (16:8)
Skip breakfast, eat within an 8-hour window — simple, free, and backed by research.
Pros
- No calorie counting required — just time restriction
- Completely free — no program, app, or subscription needed
- Good evidence for reducing calorie intake without deprivation
Cons
- Can be difficult for social situations and breakfast-lovers
- Not ideal for people with blood sugar conditions without medical supervision
- No nutritional guidance — diet quality still matters
Plant-Based Diet
Whole foods, plant-based eating linked to longevity, weight loss, and disease prevention.
Pros
- Strong evidence for reducing cardiovascular disease risk
- Environmentally sustainable and ethical for many eaters
- High fiber content supports gut health and satiety
Cons
- Risk of B12, iron, zinc, and omega-3 deficiencies without careful planning
- Requires significant meal prep and cooking skill
- Social situations and dining out can be challenging
Nutrisystem
Pre-portioned meal delivery that removes all decision-making from weight loss.
Pros
- Eliminates meal planning and calorie counting entirely
- Meals are pre-portioned for the exact right calorie intake
- Clinically studied with published weight loss results
Cons
- Most expensive program on this list at ~$270/month
- Reliant on processed, packaged foods rather than whole foods
- Weight often returns when transitioning off the program
Keto Diet
High-fat, very-low-carb eating that induces ketosis for rapid initial weight loss.
Pros
- Rapid initial weight loss (often 5–10 lbs in the first week)
- Effective for reducing appetite and food cravings
- Can improve blood sugar control in type 2 diabetics
Cons
- Extremely difficult to maintain long-term — most people quit within 3 months
- High in saturated fat — potential cardiovascular concerns long-term
- Social eating becomes very difficult; eliminates most fruits and grains
How We Rank Diets
Every diet on this list was evaluated using our transparent 12-point scoring framework, developed with input from registered dietitians and reviewed against current peer-reviewed literature.
Based on macronutrient balance, micronutrient density, and food quality scores.
Number and quality of peer-reviewed studies supporting health claims.
How realistic is it to follow this diet for 12+ months? Based on dropout rates.
Risk of nutritional deficiency, disordered eating triggers, or contraindications.
Monthly cost including program fees, groceries, and any required supplements.
How much complexity, tracking, and cooking skill does this diet require?
Frequently Asked Questions
What is the best diet for weight loss in 2026?
Based on our 2026 rankings, the Mediterranean Diet scores highest overall due to its combination of strong evidence, sustainability, and weight loss effectiveness. For behavior-change focused weight loss with coaching support, Noom ranks #4 and may be a better fit for some people. The best diet is ultimately one you can maintain long-term.
Are GLP-1 medications compatible with these diets?
Most diets on this list are compatible with GLP-1 medications like Ozempic and Wegovy. The Mediterranean Diet is widely considered the best dietary complement to GLP-1 therapy — its high protein content helps preserve muscle mass during rapid weight loss. See our dedicated GLP-1 & Diet Guide for more detail.
How were these diets scored?
We used a 12-criterion framework developed by our registered dietitian team, scoring each diet on nutrition quality, scientific evidence, sustainability, safety, cost, ease of compliance, and more. Each criterion was weighted and averaged to produce a final score out of 10.
Which diet is best for people with diabetes?
The DASH Diet and Mediterranean Diet have the strongest clinical evidence for improving blood sugar control in people with type 2 diabetes. Both are endorsed by the American Diabetes Association. Always consult your healthcare provider before starting any diet if you have diabetes.
Is the keto diet safe long-term?
The evidence on long-term keto safety is mixed. While it can be effective for initial weight loss and blood sugar control, concerns remain about saturated fat intake and cardiovascular risk with prolonged use. Most clinical guidelines do not recommend keto as a permanent dietary pattern. A Mediterranean-style approach is considered safer for long-term adherence.
Related Articles
Not sure which diet is right for you?
Answer 6 quick questions and get a personalized recommendation matched to your goals, budget, and lifestyle.
Take Our Diet Quiz →