Plans for Your Body · Weight & body composition
The weight-loss plan
Losing it is the easy part. Keeping it off is the plan.
The goal: Most diets work for six months and fail by two years, because the body fights back and the muscle went with the fat. Lose slowly, eat real food built on protein, lower insulin, lift weights, sleep, then plan maintenance as a phase of its own. Track your weekly average, your waist and your strength.
You already know how to lose weight. You’ve done it, possibly several times. The problem is the rebound: hunger climbs, energy expenditure drops, and the weight returns, often with less muscle than you started with. This plan treats fat loss and keeping it off as two jobs, and builds the second one in from day one.
- MeasureWeekly average weight · waist · strength baseline · fasting insulin · HbA1c
- LoseProtein first · cut refined carbs · eating window · lift 3×/week · sleep
- KeepPlanned maintenance · same habits, more food · weigh weekly · act on a 2 kg drift
Most plans end at the goal weight. This one starts its hardest part there.
Not medical advice
Discuss everything here with a medical doctor before acting on it — supplements included. Your doctor has your bloodwork and history. We have neither.
02 Why it matters
The body defends its weight.
The default
Crash diet, lots of cardio, little protein. The scale drops fast, a good chunk of it muscle. Then hunger wins, the weight returns as fat, and you start the next attempt with a slower metabolism and less muscle than the last one.
The better bet
Lose at a pace you can hold, protect muscle with protein and lifting, and lower the insulin that keeps fat locked in storage. Then treat maintenance as its own phase, with its own rules. People who keep weight off for years mostly do the same few things, every week.
The cost of yo-yo
Six years after The Biggest Loser, contestants had regained most of the weight, and their resting metabolism was still about 500 kcal a day lower than their new size predicted. Fast, brutal loss has a long tail.
Knowing why the weight comes back changes how you take it off. Here’s the mechanism.
03 How it works
Hormones set the appetite. Muscle sets the budget.
Fat storage is regulated, not just accumulated. Insulin decides whether fat goes in or comes out. Leptin, made by fat, tells your brain how much you have; lose fat and leptin falls, so hunger rises. Lose muscle along the way and you’ve shrunk the tissue that burns the most and stores the most glucose. Work with those, and for many people eating less stops being a daily fight.
- Insulin
- High insulin keeps fat in storage. Frequent refined carbs and snacking keep it high all day. Lower it, and the body can reach its own fat between meals. Fung and Ludwig both build on this.
- Ultra-processed food
- In Kevin Hall’s NIH inpatient trial, people offered ultra-processed meals ate about 500 kcal a day more than on minimally processed meals matched for sugar, fat and fibre, and gained weight. The food itself drives overeating.
- Metabolic adaptation
- Rudolph Leibel’s lab at Columbia showed it directly: people holding a weight 10% below their usual burned noticeably less energy than their new size predicted, mostly because their muscles did the same work on less fuel. Falling leptin drives it, and in people who had kept the weight off for over a year, the gap was still there. It’s biology, not weakness. Muscle, sleep and a planned maintenance phase help you live with it.
- Muscle
- Your largest glucose sink and a big share of your resting energy use. Lose it on a diet and you’ve made the next regain easier. Protein and lifting are how you keep it.
- Sleep
- In a controlled trial, dieters sleeping 5.5 hours instead of 8.5 lost about half as much fat and more muscle, on the same diet, and were hungrier.
- Set point, not willpower
- Canada’s obesity guideline treats obesity as a chronic disease. That means it needs ongoing management, like blood pressure, not a one-off effort.
04 The steps
Measure. Lose at a sane pace. Then plan to keep it.
Measure · Week 0
Measure more than the scale.
- Weekly average weightdaily, morning, after the toilet
Weigh every morning and track the 7-day average. Daily numbers swing 1–2 kg on water and salt; the average doesn’t lie.
- Waisttape, monthly
At the belly button, relaxed, after breathing out. Divide by your height; under 0.5 is the target.
- Strength baselineweek 1 of lifting
Write down what you lift, for how many reps. If strength holds or rises while weight falls, you’re losing fat, not muscle.
- Fasting insulin and glucosemorning, after an overnight fast
Together they give HOMA-IR, a simple insulin-resistance score. Fasting insulin often isn’t covered in Canada. It’s cheap to pay for.
- HbA1c, lipids, thyroidask your doctor
A baseline, and a check for medical reasons weight is hard to lose: thyroid, medications, sleep apnea.
- Body compositionoptional, DEXA
Shows fat and lean mass separately. Worth it if you want proof you kept the muscle.
Lose · Months 1–6
Lose fat. Keep everything else.
Aim for about 0.5–1% of body weight a week. Faster usually means more muscle lost and a harder rebound. If you have a lot to lose, the early weeks will run faster; that’s fine.
- Protein1.2–1.6 g/kg of goal weight, daily; more is fine
Eat it first at every meal. Higher protein preserves muscle in a deficit and is the most filling macronutrient. In a McMaster trial, dieters on 2.4 g/kg gained muscle while those on 1.2 g/kg didn’t, and lost more fat. With kidney disease, ask your doctor first.
- Real foodprotein first
Build meals on protein, vegetables and natural fats: fish, meat, eggs, dairy, legumes, nuts. Protein and fibre keep you full and flatten glucose spikes. Minimally processed food is harder to overeat. That’s the cheapest calorie control there is.
- Sugar and refined carbscut hard
Sugar, sweet drinks, juice, white flour and most packaged snacks. The fastest lever on insulin, blood sugar and triglycerides.
- Eating windowdaily, e.g. noon to 8 pm
Eat inside a fixed window and not outside it. Fewer insulin spikes per day, fewer chances to overeat. Fewer eating occasions means fewer decisions, and less food without counting it.
- Lift3×/week, full body
Squat or leg press, a hinge, a push, a pull, a carry. 2–3 sets of 6–12 reps, stopping 1–3 reps short of failure. The signal that tells your body to keep muscle while it sheds fat.
- Walk7,000–10,000 steps a day
Low enough intensity not to drive up hunger, and it adds up. People who keep weight off move a lot, every day.
- Sleep7+ hours
One short night measurably worsens insulin sensitivity, blood sugar and appetite the next day. The cheapest part of the protocol, and the most skipped. Short sleep shifts weight loss from fat to muscle.
- Alcoholnone while losing
Calories that don’t fill you, and lower inhibitions around everything else. Cut it while you’re losing.
Not counting calories?
You don’t have to. Protein first, real food, a window and no liquid calories create a deficit for many people. If the weekly average hasn’t moved in three weeks, then measure what you eat for a week.
Extra tools · optional, with your doctor’s OK
Two levers, and one conversation.
- 36-hour fastoptional, once a week
Dinner one day, then only water, black coffee or tea until breakfast two days later. A standard protocol in Dr. Fung’s clinic: long enough for insulin to fall and the body to draw on stored fat. A pinch of salt helps with headaches. Some people find one long fast easier than daily restraint. If it leaves you bingeing the day after, drop it.
- Psyllium husk~5 g, twice a day, with a full glass of water
A soluble fibre. Always with plenty of water: taken dry, it can choke or block. Soluble fibre adds fullness for almost no calories.
Find it on Amazon: Psyllium husk - Weight-loss medicationask your doctor
Ask your doctor whether a GLP-1 medication fits your case. If you take one, the protein and lifting on this page matter more, not less: you want the loss to come from fat. In STEP 1, people who stopped semaglutide regained two-thirds of the loss within a year.
Before you fast
Don’t do extended fasts if you’re on insulin or other diabetes medication, pregnant, breastfeeding, underweight, or have a history of eating disorders, unless your doctor approves.
Keep it off · Month 6 onward
Maintenance is a phase. Plan it.
- Step up slowlyover 2–4 weeks
Add food back gradually, mostly protein and whole-food carbs, until the weekly average stops falling. That’s your new intake.
- Keep the habitssame rules, more food
Protein first, real food, the window, lifting, walking, sleep. The habits that lost the weight are the ones that hold it.
- Weigh weeklythe early-warning system
Regular self-weighing is one of the most consistent habits among long-term maintainers. Leibel’s work is the reason: the pull to regain doesn’t switch off, so you need an early warning. Pick a trigger, e.g. a 2 kg rise in the weekly average, and act on it the same week.
- Keep liftingfor good
Muscle you keep is metabolism you keep. Maintainers in the US National Weight Control Registry report about an hour of activity a day.
- If the numbers won’t moveyour doctor
Take the before-and-after numbers to your doctor. Whether you need medication is their call. Needing it isn’t failure. If you can’t lose despite doing this properly for 3–6 months, ask your doctor about medical causes and treatment options. Obesity is a chronic disease; treating it isn’t cheating.
05 The rules
Short list. No exceptions.
Choose
- Protein first at every meal
- Minimally processed food you cook yourself
- Lifting 3 times a week, walking daily
- 7+ hours of sleep, at fixed times
Avoid
- Crash diets and losing more than 1% a week for months
- Liquid calories: juice, pop, fancy coffee, alcohol
- Ultra-processed snacks and ‘diet’ products
- Cardio as your only exercise
Non-negotiables
- Lift weights, or you’ll lose muscle with the fat.
- Judge progress by the weekly average, the waist and your strength, not one morning.
- Plan maintenance before you reach the goal.
- Talk to a medical doctor before you fast, change medication or start a supplement.
06 Checkpoints
What to track, and what good looks like.
Three numbers tell you whether you’re losing fat or just losing weight.
| What | Target | How and when |
|---|---|---|
| Weekly average weight | Down 0.5–1% a week while losing; within ±2 kg in maintenance | Daily morning weigh-in, 7-day average. Compare week to week, not day to day. |
| Waist-to-height | <0.5 | Monthly, at the belly button, after breathing out. |
| Strength | Holding or rising | Your training log. Falling strength on a diet usually means too fast, too little protein or too little sleep. |
| Lean mass (DEXA) | Most of the loss from fat | Optional, every 6–12 months. Same machine each time. |
| HOMA-IR | Under ~1.0 ideal; over ~2.5 suggests insulin resistance | Fasting glucose (mmol/L) × fasting insulin (µU/mL) ÷ 22.5. Retest at 6 months. |
| HbA1c | <5.7%, and falling | Every 6 months. Diabetes Canada flags 6.0–6.4% as prediabetes. |
Expect stalls. A flat fortnight is normal; a flat month means something needs to change.
07 Where experts disagree
Where the experts don’t agree.
Nobody serious disputes that you need to eat less than you burn to lose fat. The fight is over what makes that happen, and what keeps it happening.
Is it calories, or insulin?
Insulin first: Fung, Ludwig
Refined carbs drive insulin up, which locks fat in storage and leaves you hungry. Lower insulin and the body eats less without being told to.
Energy balance: Hall
In tightly controlled metabolic-ward studies, cutting carbs or cutting fat with calories held equal produced little difference in fat loss. Calories in still decide the outcome.
Our read Both are partly right. Calories decide whether fat leaves; insulin and food quality decide how hard it is to eat fewer of them. Use the second to get the first.
Does low-carb help you keep it off?
Yes: Ebbeling, Ludwig
In a 20-week feeding trial after weight loss, people on a low-carb diet burned roughly 200–280 kcal a day more than those on a high-carb diet.
Not proven: Hall
The result depends on how the data were analysed; with the originally planned analysis, the difference largely disappears.
Our read Unsettled. The diet you can keep for years matters more than a disputed 200 kcal. If low-carb is that diet for you, good.
Is fasting better than just eating less?
Fasting: Fung
Fasting lowers insulin in a way that grazing on fewer calories doesn’t, and makes the rest of the week easier.
Trialists: Liu et al.
In a 12-month trial, time-restricted eating plus calorie restriction did no better for weight than calorie restriction alone.
Our read Fasting works mostly because it makes eating less easier to stick to. Use it if it does that for you.
Is regain the rule?
The body fights back for years: Leibel, Rosenbaum
A reduced body burns less than its size predicts and feels hungrier, and that state persisted in people who had kept weight off for over a year. Keeping it off is ongoing work against a defended weight.
Many do keep it off: Wing, Phelan
By their estimate, about one in five people with overweight lose at least 10% and keep it off for a year or more. Registry members who keep it off for years share a few habits: lots of activity, regular weighing, a consistent diet.
Our read Both true. The pull back is real and lasting; the habits that beat it are known. Plan for maintenance as a permanent job, and treat medication as a fair option if the pull wins.
Medication or lifestyle?
Treat it as disease: Wharton and the Canadian guideline
Obesity is a chronic disease. Medication and surgery are legitimate treatments, alongside nutrition, activity and psychological support.
Muscle first: Lyon
Weight-loss drugs can take muscle along with fat. Without protein and resistance training, you trade one problem for another.
Our read Not either-or. Whether a drug is right for you is your doctor’s call. Whatever you decide, protect the muscle.
08 Limits
What this plan can’t fix.
Your biology
Genes, age, and a long history of high weight all shape the weight the body defends. After a loss, the drop in energy use and the rise in hunger Leibel measured don’t fully go away. Some people will need medical treatment to get and stay where they want. That’s a disease being treated, not a failure.
Medical causes
Hypothyroidism, sleep apnea, Cushing’s, PCOS and many medications (steroids, some antidepressants, antipsychotics, insulin) push weight up. If nothing moves, ask your doctor to look.
Eating disorders
If food feels out of control, or restriction leads to bingeing, this isn’t the plan to start with. Talk to your doctor first.
The plan fixes the inputs. The body still gets a vote.
09 Resources
Worth your time.
The Obesity Code
The case that insulin, not calories alone, drives weight gain.
Changes in energy expenditure resulting from altered body weight
The classic study showing the body adjusts its energy use to resist weight change, in both directions.
Always Hungry?
The carbohydrate-insulin model, applied: why cutting refined carbs makes eating less easier.
Forever Strong
Why muscle, not fat, is the thing to manage, and how much protein that takes.
Obesity in adults: a clinical practice guideline
What your Canadian doctor is working from, including medication and surgery options.
10 Questions
Questions, answered plainly.
How fast should I lose weight?
About 0.5–1% of your body weight a week. Faster early on is fine if you have a lot to lose; sustained faster loss tends to cost muscle and makes regain more likely.
Why do I always regain the weight?
After weight loss, hunger rises and you burn less than your new size predicts. Leibel’s studies found that gap still there more than a year later. Add lost muscle and old habits, and the weight comes back. Protein, lifting, sleep, regular weighing and a planned maintenance phase improve the odds; they don’t guarantee it.
How much protein do I need to lose fat and keep muscle?
At least 1.2–1.6 g per kg of goal body weight a day; more is fine for healthy kidneys. Eat it first at each meal. If you have kidney disease, ask your doctor.
Do I need to count calories?
Not at first. Protein first, real food, an eating window and no liquid calories create a deficit for many people. If your weekly average stalls for three weeks, track for a week to see why.
Should I do cardio or weights to lose weight?
Weights, plus a lot of walking. Lifting keeps the muscle; walking adds up without spiking hunger. Harder cardio is good for your heart, but it isn’t the main fat-loss lever.
Will weight-loss drugs make me lose muscle?
Some of the weight lost on them is lean mass, as with any diet. Enough protein and regular strength training help make the loss mostly fat. Ask your doctor whether a medication suits you.
11 Sources
Where this comes from.
Experts drawn on
- Rudolph Leibel, MD — Professor of pediatrics and medicine, Columbia University. Co-discovered leptin; his lab showed how the body defends a reduced weight.
- Jason Fung, MD — Nephrologist, Toronto. Author of The Obesity Code.
- David Ludwig, MD, PhD — Endocrinologist, Boston Children’s Hospital and Harvard. Carbohydrate-insulin model of obesity.
- Gabrielle Lyon, DO — Physician; founder of muscle-centric medicine. Author of Forever Strong.
- Kevin Hall, PhD — Metabolism researcher; led NIH inpatient trials on diet and energy balance.
- Sean Wharton, MD — Obesity medicine physician, Ontario. Lead author of Canada’s 2020 adult obesity guideline.
Sources
- Obesity in adults: a clinical practice guideline. Canadian Medical Association Journal, 2020.
- Changes in energy expenditure resulting from altered body weight. New England Journal of Medicine, 1995.
- Long-term persistence of adaptive thermogenesis in subjects who have maintained a reduced body weight. American Journal of Clinical Nutrition, 2008.
- Ultra-processed diets cause excess calorie intake and weight gain: an inpatient randomized controlled trial of ad libitum food intake. Cell Metabolism, 2019.
- Persistent metabolic adaptation 6 years after “The Biggest Loser” competition. Obesity, 2016.
- Long-term weight loss maintenance. American Journal of Clinical Nutrition, 2005.
- Higher compared with lower dietary protein during an energy deficit combined with intense exercise promotes greater lean mass gain and fat mass loss: a randomized trial. American Journal of Clinical Nutrition, 2016.
- Insufficient sleep undermines dietary efforts to reduce adiposity. Annals of Internal Medicine, 2010.
- Effects of a low carbohydrate diet on energy expenditure during weight loss maintenance: randomized trial. BMJ, 2018.
- Calorie restriction with or without time-restricted eating in weight loss. New England Journal of Medicine, 2022.
- Once-weekly semaglutide in adults with overweight or obesity (STEP 1). New England Journal of Medicine, 2021.
- Weight regain and cardiometabolic effects after withdrawal of semaglutide: the STEP 1 trial extension. Diabetes, Obesity and Metabolism, 2022.
Not medical advice
Discuss everything here with a medical doctor before acting on it — supplements included. Your doctor has your bloodwork and history. We have neither.