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Where did the 1,200-calorie diet come from?
Answered by Nikkiey Stott and her guests · Updated
The short answer
The 1,200-calorie diet traces back to 1918, when physician Lulu Hunt Peters published one of the first popular diet books and told women to eat about 1,200 calories a day. Nikkiey explains it was a round number, not metabolic research. Medical guidelines later used 1,200 as a supervision floor, and that floor got repackaged as a target.
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Nikkiey on the 1918 diet book that gave women the 1,200-calorie number
Plays from 1:06 · Video: 5 Weight Loss Rules That Backfire on Women Over 40
How a medical safety floor got repackaged as a weight loss target
Plays from 1:41 · Video: 5 Weight Loss Rules That Backfire on Women Over 40
Why 1,200 calories is the default in apps, and why it wasn't science
Plays from 0:50 · Video: 5 Weight Loss Rules That Backfire on Women Over 40
What to eat instead: Nikkiey's 1,700 to 2,200 calorie range for women over 40
Plays from 3:56 · Video: 5 Weight Loss Rules That Backfire on Women Over 40
The full answer
Nikkiey calls 1,200 the most famous number in dieting. It is built into weight loss apps, it is the default in MyFitnessPal, and your doctor may have suggested it. Her point is that it never came from science. Lulu Hunt Peters introduced calorie counting to the American public, and she picked 1,200 because it sounded restrictive enough to produce visible results. It wasn't personalized, and it wasn't based on any study of how metabolism works.
The second half of the story is the part Nikkiey wants you to hear twice. Medical guidelines later adopted 1,200 as the minimum intake before a diet requires medical supervision. In other words, it marks the point below which doctors consider it risky to go without monitoring. Over the decades, that safety threshold was turned into a goal. She sums it up as a hundred-year-old guess that became a medical safety floor that became a target on your phone.
She also explains why this matters more after 40. At 25, your body might tolerate 1,200 calories for a stretch. In her experience, it backfires on a body over 40. If 1,200 never worked for you, the number was the problem, not you.
What Nikkiey recommends instead:
- Base your calorie target on your body composition, activity level and metabolic state, not on a number from 1918.
- Expect it to be higher than you think. She says most women over 40 she works with need 1,700 to 2,200 calories to lose fat while preserving lean muscle.
- Pair that intake with the right macro breakdown. In her words, more food with the right macros is the fix.
She describes a client who, three months after eating more, was lighter than she ever was at 1,200 because her metabolism was running again instead of running on fumes.
From Nikkiey Stott and WarriorBabe's coaching. For education, not medical advice: talk to your doctor about your own health.
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Why am I not losing weight on 1,200 calories?
Eating 1,200 calories is often too little, not too much. Dr. Stacy Sims explains it sits around an average resting metabolic rate, so your body treats it as a threat, conserves energy and breaks down lean mass. Long-term dieting also adapts your metabolism down. Before cutting further, check your tracking is accurate.
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Do carbs make you gain weight?
No. Nikkiey explains that carbs on their own don't make you gain fat. Eating more calories than your body burns does, whether those calories come from carbs, fat or protein. Carbs are stored as glycogen, which holds about three grams of water per gram, so the scale can rise temporarily without any fat gain.
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Do I have to cut carbs to lose weight?
No. On The WarriorBabe Show, Nikkiey's position is that you don't need to cut carbs to lose fat. She calls carbs fuel, not the enemy, and says very low carb mostly drops water weight at first. Over time, under-eating carbs can drain your energy, hurt your workouts and make building muscle nearly impossible.
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22 min5 Weight Loss Rules That Backfire on Women Over 40
Video · Sep 11, 2026