If you’re trying to lose weight, you’ve probably asked yourself: “Does cutting calories help lose weight?” For years, the standard advice has been to reduce your daily caloric intake. But a new clinical trial suggests there’s a better way — intermittent fasting, specifically fasting every other day.
Published in the Annals of Internal Medicine (March 31, 2025), this study found that participants following a 4:3 intermittent fasting plan lost more weight and stuck with their diet longer than those who simply reduced their calorie intake.
Let’s explore how this works, why it might outperform traditional dieting, and how you can get started — even if you don’t want to count calories every day.
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What Is 4:3 Intermittent Fasting?
The 4:3 intermittent fasting method involves:
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Fasting for three nonconsecutive days per week
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On fasting days, cutting calorie intake by about 80% (typically 400–600 calories)
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Eating without restriction on the other four days
This approach alternates fasting and feeding, helping to reduce total weekly intake while avoiding the fatigue of daily calorie restriction.
RELATED: 4 Ways Intermittent Fasting Can Improve Your Health
The Study: Intermittent Fasting vs. Daily Calorie Cutting
Study Design:
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165 overweight or obese adults
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Group 1: 4:3 intermittent fasting
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Group 2: Cut calories by 34% daily
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All participants were asked to exercise 300 minutes per week (double the national guideline)
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Both groups received dietitian-led weight loss coaching
Results After One Year:
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Fasting group lost 8% of body weight
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Calorie-cutting group lost 5%
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38% of fasters lost ≥10% of their body weight, vs. 16% of calorie cutters
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Dropout rate: 19% (fasting) vs. 30% (calorie reduction)
The findings show intermittent fasting not only supports more weight loss but also boosts long-term adherence, which is a huge factor in success.
Why Fasting Works (Even Better Than Cutting Calories)
You might wonder, “If I eat fewer calories every day, why isn’t it working?” The answer could lie in behavior and biology:
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You naturally eat less over the week with fasting, but without daily restrictions
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Calorie fatigue from tracking every meal leads to burnout
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Fasting may improve metabolic flexibility, encouraging the body to burn fat more efficiently
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Intermittent fasting may reduce hunger hormones and inflammation
That’s why some people find results faster with a structured plan like this — even those stuck in a “3 weeks calorie deficit, no weight loss” frustration.
RELATED: Thinking About Water Fasting? Here’s 5 Things You Should Know First
Common Concerns About Fasting
Here are some top search queries from people researching intermittent fasting — and the facts behind them:
Will fasting cause heart attacks?
There’s no clinical evidence linking intermittent fasting to heart attacks. In fact, this study found improvements in:
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Blood pressure
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Cholesterol
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Blood sugar
That said, people with heart conditions should consult their doctor before starting any restrictive eating plan.
What about fasting gas or constipation?
Digestive changes like bloating, gas, or constipation can happen during the adjustment period. To minimize issues:
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Stay hydrated
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Eat high-fiber foods on eating days
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Include fermented foods like yogurt or sauerkraut
Is eating fast bad for you after fasting?
Yes — rapid eating can lead to overeating, gas, and spikes in blood sugar. Be mindful: chew slowly and eat balanced meals.
Intermittent Fasting vs. 1200–1500 Calorie Diets
Many dieters aim for a 1200-calorie meal plan or try a 1500-calorie-a-day weight loss strategy. While these can create calorie deficits, they often lead to:
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Persistent hunger
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Fatigue and mood swings
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Difficulty sustaining the diet
By contrast, 4:3 intermittent fasting may allow you to eat more freely on non-fasting days, making the process feel less restrictive, and possibly more effective over time.
How to Lose Weight Without Counting Calories Every Day
One major benefit of intermittent fasting is that you don’t have to obsess over every bite. Here’s how you can get started:
Step 1: Choose Your Fasting Days
Pick three nonconsecutive days (e.g., Monday, Wednesday, Friday). Consistency builds habit.
Step 2: Plan Fasting Day Meals
Aim for 400–600 calories, emphasizing:
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Lean protein (chicken, fish, tofu)
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Leafy greens and non-starchy veggies
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Broth-based soups
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Hydration (herbal teas, water)
Step 3: Eat Balanced on Feast Days
Don’t overdo it. Stick to:
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Complex carbs (quinoa, brown rice)
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Healthy fats (avocado, olive oil)
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Protein and fiber to keep you full
Step 4: Keep Moving
Aim for 300 minutes of exercise per week — walking, resistance training, swimming, or cycling.
Best Foods for Fasting Success
Some foods can make fasting easier and more effective:
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Watermelon – low-calorie and hydrating (yes, it’s good for weight loss!)
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Eggs – high in protein, low in calories
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Greek yogurt – great for digestion and protein
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Vegetables – especially leafy greens and cruciferous types
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Legumes and beans – good for fiber and satiety
When Fasting Isn’t the Best Fit
While intermittent fasting can be effective, it’s not suitable for everyone, especially:
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People who are underweight or have disordered eating patterns
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Pregnant or breastfeeding women
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Those with medical conditions requiring regular food intake
For others — especially those frustrated by “weeks of calorie deficit with no weight loss” — it can offer a fresh, more sustainable alternative.
Final Thoughts: Should You Try Fasting?
So, does cutting calories help lose weight? Yes — but how you cut them matters.
If daily restrictions feel exhausting, 4:3 intermittent fasting could help you:
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Lose weight without counting calories every day
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Stay committed long term
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See better health improvements
Always talk to your healthcare provider before making major dietary changes, especially if you have underlying conditions.
