Case Study 1 — Renata: Four Months at "About 1,500"

A clinical case. Renata Almeida is an illustrative composite.

Setup

Renata Almeida: 29, insurance claims adjuster, 165 cm, 76 kg. Sits nine hours a day. Walks the dog twenty minutes most evenings. No medical history, no medications, periods regular.

She'd been eating "about 1,500 calories" for four months. Lost seven pounds in three weeks, then nothing for thirteen. She arrived having already diagnosed herself: broken metabolism.

Let me show you what the twenty minutes of arithmetic actually revealed, because the answer wasn't what either of us expected at the start.

Step 1: The numbers on paper

Mifflin-St Jeor:

10 × 76            =   760
6.25 × 165         = + 1,031.25
5 × 29             = −   145
constant (female)  = −   161
                     ─────────
RMR                =  1,485.25  ≈  1,485 kcal/day
Range (±10%)       =  1,337 – 1,634

Activity factor. She'd used 1.375 ("light exercise 1–3 days/week") on the website, which gave 1,850 — that's where her target came from. But a twenty-minute dog walk and nine hours seated is closer to 1.3, arguably 1.25.

TDEE at 1.375  =  2,042   (what the website told her)
TDEE at 1.3    =  1,931
TDEE at 1.25   =  1,856
Full range across RMR error and factor uncertainty:  ~1,671 – 2,247

So her "deficit" of 350 calories (1,850 − 1,500) was calculated against a number that could plausibly have been anywhere in a 576-calorie band.

That alone doesn't explain thirteen weeks of nothing. But note what it does: it means neither of us knew what her deficit was. We were both working from a number that felt like a measurement and wasn't.

Step 2: What "about 1,500" turned out to mean

I asked her to keep three days properly — in the moment, weekday and weekend, cooking oil measured.

Three-day average: 1,910 kcal.

Not 1,500. And — this is the part that mattered clinically — she wasn't being careless. Her weekday recorded intake was genuinely close to 1,550. Here's where the rest came from:

Weekday intake ~1,550. Weekend intake ~2,400 average across Saturday and Sunday.

Weekly total: 1,550 × 5 + 2,400 × 2 = 12,550 kcal, or 1,793/day averaged. Add the oil and the oat milk she hadn't been counting on weekdays either, and 1,910 is about right.

Against a TDEE of somewhere around 1,900–1,950.

She was eating at maintenance. Almost exactly.

Step 3: So why the first seven pounds?

Because the first three weeks were different.

New regimes are always adhered to better than old ones. In weeks one to three she genuinely was near 1,500, she genuinely was in a deficit — and, critically, she'd also cut carbohydrate substantially in that period, which depleted glycogen and its bound water (§4.9). Of the seven pounds, probably three to four were glycogen and water and two to three were fat.

Then adherence drifted, as it does for everyone, in increments too small to notice: a weekend, an oat milk, two squares of chocolate. The deficit closed. The scale stopped.

And because she believed she was still eating 1,500, the only available explanation was that her body had stopped responding.

That's the mechanism by which "broken metabolism" gets constructed. It isn't stupidity or denial. It's a completely reasonable inference from a false premise she had no way to check.

Step 4: What I actually said

Not "you're eating 400 more than you thought."

I said: "I think we've been working from a number neither of us could see. Can I show you what happens when we use the real one?"

Then I put the three numbers side by side:

And Renata — who is sharp, and who had spent four months believing her body was defective — looked at it and said: "Oh. So it's working exactly like it's supposed to."

That sentence was worth more than any intervention I could have prescribed. Because a body that responds predictably is a body you can work with. A broken one can only be mourned.

Step 5: The plan

Not "eat less." She'd already been trying to eat less for four months and it had produced four months of self-blame.

Three changes, targeting the specific sources:

Net: ~−205 kcal/day. A deficit of around 200 against a TDEE of ~1,925.

Predicted rate: roughly 0.4 lb per week. About 1.7 lb a month.

She was disappointed by that number. Everyone is. And it is genuinely the right number: at 200 kcal she'll barely notice the deficit, NEAT suppression will be minimal, hunger will be manageable, and — the only thing that actually matters — she might still be doing it in a year, at which point it's 20 lb.

Her previous attempt targeted 350 and delivered zero, because she couldn't sustain it and didn't know she wasn't.

Analysis

1. The failure was informational, not motivational. Renata had excellent adherence to a plan built on two numbers that were both wrong — her TDEE (overestimated by the website's activity factor) and her intake (underestimated by ~400). Neither error was her fault and neither was visible from inside.

2. Weekend inflation is the most common invisible cause of a plateau. Five weekdays at −350 and two weekend days at +700 nets to zero across the week, and every single weekday feels like success. This is why the Chapter 4 checkpoint insists on including a weekend day.

3. The right response to a plateau is measurement, not restriction. Renata's instinct — and almost everyone's — was to cut further. Cutting further from a false baseline would have meant a real intake of ~1,700 against a TDEE of ~1,925: a deficit of 225, achieved through misery, with no understanding of why. The measurement got her a comparable deficit with far less cost.

4. Deliberately keeping something is part of the plan, not a concession. The chocolate stays. Not as a reward or a cheat — as a design decision, because a plan with zero pleasure has a half-life of about five weeks and I have watched it happen several hundred times.

Discussion Questions

1. Renata's deficit calculation was wrong on both sides. Which error was larger, and which was more damaging psychologically? Are those the same answer?

2. "So it's working exactly like it's supposed to" — why was that sentence therapeutically valuable? What would have been lost if I'd opened with the 400-calorie discrepancy instead?

3. The plan targets 200 kcal/day and predicts 1.7 lb per month, which disappointed her. How do you present a slow rate honestly without losing the person? Write the actual words.

4. The chocolate is kept deliberately. Defend that clinically. Then argue against it — is there a version of this that's just avoiding a difficult conversation?

5. Renata had no medical red flags. At what point in this consultation would a red flag have changed the entire approach, and which of §5.11's items would you have been listening for?

Your Turn

If you've done both checkpoints — the Chapter 4 diary and the Chapter 5 calculation — build Renata's table for yourself.

Then, separately: calculate your weekday average and your weekend average.

Most people have never done this and find the gap between them larger than anything else in their diary. If yours is more than about 400 calories, you have found the thing that has been quietly cancelling your weekdays — and it costs one decision per week to change, rather than twenty-one.