Not all weight loss is the kind you want, and a crash diet takes the wrong kind first. By Pranav Raut, postpartum coach for NRI mothers.
The short answer
A crash diet after a birth fails for a reason that has nothing to do with willpower. It takes the weight you needed to keep and leaves the weight you wanted to lose.
Your body weight is made of fat mass and fat-free mass. Fat-free mass is your muscle, your bone, your organs, your water and the electrolytes in it. Fat loss is the goal. Losing fat-free mass is a cost, and severe restriction charges that cost early, because lean tissue is one of the easier things for your body to give up.
Add breastfeeding and the problem compounds: your requirements are higher at the exact moment you’re cutting them.
Then, because none of it is sustainable on broken sleep, you stop, and the weight returns. That’s the method’s failure, and it was never yours.
The protein problem
Your body makes milk from a pool of amino acids that comes from what you eat and from the protein already in your body. When intake falls well below requirement, your body breaks down more of its own protein stores to cover the gap, and the largest of those stores is your muscle.
A body that’s short of protein takes it from wherever it has the most, and that’s lean tissue.
The requirement while feeding is also higher than almost anyone assumes. The current official recommendation for a lactating woman is around 1.05 grams per kilogram of body weight per day. Research using more modern measurement methods suggests the real requirement may be considerably higher, in the region of 1.7 to 1.9 grams per kilogram.
Now think about the average crash diet. It cuts calories hard, which cuts food volume, which cuts protein first, because protein foods are often the ones that get dropped when the plate gets smaller. So a mother whose requirement has gone up ends up eating less protein than she did before she was pregnant.
That’s the mechanism, and it’s arithmetic rather than a hormone story, running in the wrong direction at the worst possible time.
What about bone
You’ll read that crash dieting breaks down your bones to supply calcium for milk. The real picture is less alarming.
Bone mineral does change during lactation, and the change appears to be driven largely by the hormonal state of breastfeeding rather than by how much calcium you eat. It’s generally described as temporary, with recovery after weaning.
So the bone changes of lactation are mostly outside your control and mostly not worth panicking about. What you can influence is your protein, your vitamin D and your overall nutritional adequacy, which are worth getting right for plenty of reasons, this one included.
If you’re concerned about your bone health specifically, take that to your doctor. It’s no reason to fear breastfeeding.
Milk supply
Gradual fat loss is considered safer for supply than rapid loss.
What raises real concern is a sharp, severe cut in intake, particularly in the early weeks, along with dehydration and skipped meals.
Exercise isn’t on that list. Moderate exercise is generally considered compatible with breastfeeding and has not been shown to impair milk production, milk composition or infant growth.
So if you’re worried about your supply, avoid the restriction and keep the training. Many mothers have that backwards, which is why so many end up sitting still and eating too little at the same time.
Why the weight comes back
Set aside the lean mass and the supply, and there’s still a plainer reason crash diets fail after a birth: you can’t keep them up in your circumstances.
You’re feeding, or you’ve recently stopped. You’re sleeping in pieces, and broken sleep affects appetite regulation and cravings, which is why the day after a bad night is the day the plan falls apart. You may be back at work. The food at home is what the whole family eats, and it arrives already cooked. Nobody is minding the baby while you prepare a separate meal.
A plan that needs ideal conditions will fail in real ones, and that failure belongs to the plan.
And when you stop, you restart with less muscle than you had, which makes the next attempt slightly harder than the last. That’s the pattern behind mothers who say each round gets more difficult. They aren’t imagining it.
The test that tells you which kind of weight you lost
Say the scale shows five kilos down, but your measurements haven’t moved and your clothes fit the same. Most of that was water, possibly with some muscle, and it will come back.
Now say the scale shows two kilos down and people are asking what you’ve been doing. You lost fat and kept your muscle, which is why two reads as five.
A scale gives you one number for fat, muscle, water and everything in your gut, and it can’t tell you which one moved. So measure instead: waist, hips, thigh and arm once a month, at the same time of day and under the same conditions. Add a photograph in the same light and the same clothes, and notice how your clothes fit.
If the scale stalls while your inches fall, the method is working and the scale is simply the weaker measure.
What to do instead
Eat at maintenance, adjusted upward if you’re feeding. The CDC puts the extra energy needed while breastfeeding at roughly 330 to 400 calories a day, which is an addition, not a deficit.
Hit your protein before you change anything else. It’s the single change that protects the most.
Take the energy gap from movement, and walk towards 8,000 steps a day.
Add resistance training, twenty minutes three or four times a week once recovery allows. It’s the strongest signal you can send your body to keep the muscle while fat comes off.
Remove the largest single surplus rather than everything at once. For most Indian mothers that’s the third laddu or the second helping.
Measure with a tape once a month.
The result is slower, and it holds. That’s the whole trade.
Frequently asked questions
How fast is too fast?
Gradual loss is considered safer for supply than rapid loss while breastfeeding. If the number is dropping in a way that feels dramatic, slow down instead of celebrating.
I already did a crash diet and my supply dropped. What now?
Restore your intake first, then speak to a lactation consultant or your healthcare professional. Supply often recovers, and this is their field rather than mine.
Is intermittent fasting a crash diet?
Not inherently, but for a feeding mother with broken sleep it usually squeezes eating into a window that makes hitting protein and micronutrients harder. I wouldn’t use it in the first year.
I lost weight fast and I feel fine. Is that not proof it worked?
It’s proof that it was tolerable, which isn’t the same thing. What matters is what you lost and whether you keep it off, so measure your inches and check again in six months.
Why do I regain faster every time?
Each round of aggressive restriction tends to cost some lean tissue, and if you don’t train to rebuild it, you restart with less. That’s the pattern repeat dieters often describe.
The one line to take away
Not all weight loss is healthy. A crash diet gives up muscle and water first, leaves more of the fat than you’d like, and the weight tends to come back.
Where to go next
Parent Fitness Coach on Instagram carries our latest postpartum guidance and the experiences of the mothers we coach.
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If you want the version that holds, How to Get Your Pre-Pregnancy Body Back in 90 Days sets out the whole method in order: recovery first, then the plate rebuilt around protein and fibre, then movement, then a single small adjustment at the end. It includes the Indian food chart, the twenty-minute home workouts, the blood work checklist and the progress tracker that measures the right things. 232 pages.
Get the ebook: Click here
If you would like a plan built around your own reports and routine, you can book a one-to-one consultation call.
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Mothers describe their experience in their own words in this video interview series.
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About the author
Pranav Raut is a postpartum coach for NRI mothers and the founder of Parent Fitness Coach and the Reverse Fat System. A certified nutritionist, he has spent six years in the postpartum space and coached more than 1,000 working mothers, including NRI mothers in the USA, Canada, the UK, Switzerland, Iceland, Singapore, Doha and Dubai.
Sources
- Protein requirements of healthy lactating women: Journal of Nutrition https://www.sciencedirect.com/science/article/pii/S2475299123081714
- Maternal calorie needs while breastfeeding: CDC, Maternal Diet and Breastfeeding https://www.cdc.gov/breastfeeding-special-circumstances/hcp/diet-micronutrients/maternal-diet.html
- Safe rate of weight loss during lactation: InfantRisk Center https://www.infantrisk.com/content/weight-loss-while-breastfeeding-whats-safe-moms
This article is for education and is not medical advice. Do not ignore the advice of your healthcare professional.