It Is Not Your Willpower. It Is Not Your Effort. Here Is What It Actually Is.
By Coach Mini | Certified Personal Trainer & Nutritionist | Founder, Riv Method
You are eating less. You are moving more. You are trying. And the scale is not moving.
Or maybe it moves a little — then comes right back. Or you lose weight but look softer, not leaner. Or you are exhausted all the time and wondering if your body is just broken.
It is not broken. But something is working against you — and it has nothing to do with your effort or your willpower.
Here is what I have noticed in my own journey and in working with postpartum moms: when I am eating well and sleeping well, everything gets easier. Not just physically — mentally too. I did not need to analyse my hormones or track every number. I just felt better, had more energy, and my body responded.
That is not a coincidence. There is real science behind it. Let me explain the four reasons that explain almost every postpartum weight loss stall — and what to do about each one.
Reason 1: You Are Not Eating Enough Protein — So You’re Losing Muscle, Not Fat
This is the single most common mistake I see. Moms reduce calories — sometimes dramatically — and the scale moves. But they are losing muscle, not body fat.
When you do not eat enough protein in a calorie deficit, your body breaks down muscle tissue for energy. You get smaller, but softer. Your metabolism slows because muscle is metabolically active tissue. The weight loss stalls. You feel weak and tired.
The result looks like: “I lost weight but I still look the same” or “I was doing so well and then it stopped.”
The fix:
→ Hit 100–120g of protein per day, minimum
→ Pair your deficit with strength training to preserve muscle
→ Never drop calories so low that you are constantly hungry — that is your body signalling muscle breakdown
Reason 2: Sleep Deprivation Is Keeping Your Cortisol High — And High Cortisol Stores Fat
Nobody talks about this enough. Sleep is not just recovery. Sleep is an active part of your fat loss process.
When you are sleep-deprived — and postpartum sleep deprivation is extreme — your cortisol levels stay elevated. Cortisol is your stress hormone. Chronically high cortisol tells your body to store fat, particularly around the abdomen. It also increases cravings for high-calorie foods and makes insulin less effective.
So you can eat well all day, then cortisol undermines it overnight. This is not a character flaw. This is physiology.
I noticed this in my own recovery. The weeks I slept better — even just one longer stretch — I felt noticeably less puffy, less hungry, and more in control of my food choices. Eating well and sleeping well are not separate goals. They are the same goal.
The fix:
→ Prioritise sleep wherever possible — nap when the baby naps if nights are broken
→ Reduce other stressors where you can — cortisol is cortisol, whether from sleep or stress
→ Do not set aggressive fat loss goals in the first 3 months — your hormones are not in a stable place yet
Reason 3: Your Calorie Deficit Is Too Aggressive — Your Body Is Holding On
There is a common belief that the bigger the deficit, the faster the results. Postpartum, this is backwards.
If you cut calories too aggressively, your body reads this as a famine signal — especially while breastfeeding, when it is already working overtime. It responds by lowering your metabolic rate, increasing hunger hormones, and holding on to fat stores as a survival mechanism.
You end up exhausted, hungry, losing muscle, and still not seeing results on the scale.
The right deficit postpartum:
→ Breastfeeding moms: 100 kcal deficit only. Your body is already using 300–500 extra calories for milk production.
→ Formula feeding moms: 200–300 kcal deficit. More flexibility, but still conservative.
→ Both: Pair the deficit with high protein and strength training to ensure fat loss — not muscle loss.
Reason 4: You Are Not Strength Training — So Your Metabolism Has No Reason to Speed Up
Cardio burns calories during the workout. Strength training burns calories for 24–48 hours after. It also builds muscle — and more muscle means a faster resting metabolism.
Most postpartum moms default to walking or cardio. Walking is excellent — 7,000–8,000 steps daily is a non-negotiable baseline. But walking alone will not change your body composition. It will not fix diastasis recti. It will not rebuild the core and pelvic floor that childbirth disrupts.
Strength training is not about getting bulky. It is about rebuilding a body that functions — and creating the metabolic conditions for sustained fat loss.
The progression:
→ Months 1–2: Core and pelvic floor only — Dead Bug, Pelvic Tilt, Glute Bridges, Bird Dog. 15 min, 5x per week.
→ Month 3+: Add strength training — bodyweight first, then progressive load.
→ Every day: 7,000–8,000 steps minimum, including rest days.
The Common Thread
Look at all four reasons above. None of them are about trying harder. They are about doing the right things in the right order.
Enough protein. Protected sleep where possible. A sensible deficit. Strength training that rebuilds rather than depletes.
When you get these four things right, fat loss becomes the natural outcome — not a daily battle. Your body stops working against you and starts working with you.
Not Sure Which Reason Is Holding You Back?
DM START on Instagram and let’s figure it out together. Coaching is not guessing — it is diagnosing exactly what is in your way and fixing it.
DM FUEL for a free nutrition audit. I will look at what you are eating and tell you exactly where the gap is.
@mini.rivmethod | info@rivmethod.com
© Riv Method | rivmethod.com/blog | @mini.rivmethod | Published October 27, 2026
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