The Best Type of Intermittent Fasting for Weight Loss: Big Breakfasts Burn Fat Faster
You can still enjoy huge meals and your favorite foods!
Love the idea of digging into big, ultra-satisfying meals while still slimming down at a brisk pace? Eating more of your calories earlier in the day may be all it takes! Growing research proves that eating a big breakfast, a decent-sized lunch and a smaller dinner can triple the speed at which we get lean. How? It’s one of the best twists on intermittent fasting for weight loss. That’s because it emphasizes morning calories, which basically set off a waist-shrinking and healing domino effect inside the body, explains Jason Fung, MD, author of mega-seller The Obesity Code. The approach helped retired nurse Lisa Chance, 69, lose 130 pounds and 22 inches from her waist. Keep reading to learn how a little calorie shift can support weight loss and deliver big health benefits in the long term.
Why a big breakfast speeds weight loss
Many of us think of fasting as waiting until lunch to eat our first meal of the day. But that’s only one method. The scientific term for the big-breakfast technique is “early time-restricted eating” or eTRE. And it’s easy to do: Consume all meals in a daily eight-hour window that starts fairly close to when you wake up—say, 7 am to 3 pm or 10 am to 6 pm—and eat a majority of your calories before dinner. “It’s a form of intermittent fasting that is very good for weight loss for a number of reasons,” says Dr. Fung.
Worried your evening appetite will make this impossible? Studies actually show eating more in the morning makes us significantly less hungry overall compared to when we eat more at night. “This strategy doesn’t require willpower,” assures Dr. Fung.
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Why this is one of the best types of intermittent fasting for weight loss
Here are some of the health benefits you can expect from shifting your calorie intake to earlier in the day:
It boosts your metabolism
Harvard researchers hoping to understand the effect of night-shift work on metabolism found that adults burned 50 percent more calories on days they ate their biggest meal at 8 am compared to days they ate their biggest meal at 8 pm. The body processes food differently in the morning as it preps to keep us energized all day, so far more of what we eat gets burned as fuel.
It blocks blood sugar spikes
In the same Harvard study, blood sugar rose twice as high after a night meal as it did after the same meal enjoyed at 8 am. Dr. Fung says this is because the body burns more sugar in the morning. That’s good for overall health and your waistline.
The reason: Blood sugar spikes cause us to pump out insulin, a hormone that stores sugar in fat cells. Excess insulin also “locks” fat cells, making it hard to turn stored fat into energy no matter how little you eat or how much you exercise. “Keeping insulin lower signals your system that it’s time to use stored fat for fuel,” says Dr. Fung.
It helps your body age in reverse
Dr. Fung says all versions of intermittent fasting help activate autophagy, a “self-cleaning” mode for the body. The process replaces or revitalizes damaged cells so you end up with younger cells. This helps the body do everything better, from burning fat and regulating hunger hormones to improving mood, reducing pain and fighting countless diseases.
The eat-early advantage: After a light dinner, your body spends more hours in autophagy than if you’d had a later or bigger meal so perks add up.
What studies tell us about early intermittent fasting for weight loss
When Dutch researchers compared a bunch of intermittent fasting studies for a 2024 report in the journal Nutrients, they found that eTRE had “a greater beneficial effect.”
They even cited evidence that overweight women given 700 calories at breakfast, 500 calories at lunch and 200 calories at dinner lost 20 pounds in 12 weeks, while women given 200 calories at breakfast, 500 calories at lunch and 700 calories at dinner lost fewer than 8 pounds. That’s right: They ate the same number of calories, but the eTRE group tripled their weight loss!
How to make a big breakfast approach work for you
Just aim to shift more of what you eat to breakfast and lunch (no need to count calories) and choose a light early-bird dinner. Most people give themselves an “eating window” of eight hours during which they eat all their meals, and then only consume water and unsweetened coffee/tea outside that window.
You get bonus points for avoiding insulin-spiking processed carbs and aiming for filling protein-rich fare to quiet blood-sugar spikes. “It’s simple and it’s powerful,” says Dr. Fung. To learn more, check out The Obesity Code or visit TheFastingMethod.com.
Intermittent fasting for weight loss success: Lisa lost 130 lbs
Lisa Chance, a 69-year-old retired night-shift nurse from California, struggled with her weight for decades. “I didn’t understand why I was hungry all the time,” she recalls. “I used to get up at 3 am and raid the refrigerator.”
Then a friend told Lisa about Dr. Fung’s book, which explains fasting could help with Lisa’s hunger, diabetes, metabolism and more. Too nervous to try longer fasts, Lisa made small, easy changes. She cut out snacking and avoided eating within a few hours of bedtime.
Lisa lost 10 pounds the first month and had many nights where she shed 0.25 pounds overnight. “It gave me hope,” she says.
At first Lisa couldn’t imagine lasting four hours without food. Then she thought of her aunt, who had eaten two meals a day her whole life. “She ate real, fat-rich foods, lived to 93 and had a tiny waist!”
Inspired, Lisa focused on consuming two to three satisfying meals per day. Wearing a continuous glucose monitor (CGM) gave her new insight. “My blood sugar was fine with unprocessed carbs like fruit if I ate them earlier, but if I had them later, it spiked,” she says. “I felt my best when I finished eating at 5 pm.” Her carb cravings even began to disappear.
Five months in, Lisa was down 60 pounds. All told, she lost 130 pounds and reversed her diabetes. Now she says, “I can deadlift 160 pounds—more than the weight I dropped. I lost beyond my wildest dreams!”
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