One Meal a Day for 6 Months While Losing 62 Pounds… And He Kept All His Muscle. Here’s How the Protocol Works

A climber’s transformation from 94 kilograms to 66 kilograms is turning heads in fitness circles—not just for the dramatic weight loss, but for the methodical, science-backed approach that made it possible.

In a recent YouTube video, climbing coach and athlete Magnus Midtbø shared the exact protocol he used to shed 28 kilograms, including a remarkable 16-week stretch where he lost exactly one kilogram per week—despite already being eight months into a calorie deficit.

His journey wasn’t driven by aesthetics but by genuine health concerns related to excess body fat.

What makes his approach different is how it prioritizes sustainable habits, mental health, and maintaining athletic performance throughout the entire process.

Starting Point: Understanding Your Calorie Baseline

Midtbø emphasizes that calorie calculators provide only rough estimates, not precise measurements of individual metabolism.

Using a 35-year-old male weighing 80 kilograms at 180 centimeters tall as an example, a standard calculator suggests maintenance calories around 2,720 per day with moderate activity levels. To lose half a kilogram weekly, that drops to approximately 2,200 calories—creating a 500-calorie daily deficit.

A kilo fat is roughly 7,700 calories. So, then we need to burn an extra 3,850 calories in 7 days. And that’s 550 calories per day.

This calculation serves as a starting framework rather than an absolute rule. Individual responses vary dramatically based on metabolism, activity patterns, and hormonal factors.

Macro Distribution: The Foundation of Fat Loss

Midtbø’s approach to macronutrients prioritizes hormonal health and muscle preservation above all else.

Fat: 0.5 to 0.8 Grams Per Kilogram

For the 80-kilogram example, that translates to 40-64 grams daily, with 64 grams recommended to support testosterone and estrogen production.

Fat intake proves critical for absorbing fat-soluble vitamins and maintaining immune function during the stress of prolonged calorie restriction. At four calories per gram, 64 grams provides 576 calories.

Protein: 2 Grams Per Desired Body Weight

Someone targeting 70 kilograms would consume 140 grams of protein daily—560 calories total.

The protein will help keep and build muscle in this weight loss. And this will increase the amount of fat you burn every day and how fast you are done with this weight loss.

This higher protein intake becomes essential for preserving lean mass, which directly impacts metabolic rate and daily calorie expenditure.

Carbohydrates: The Remaining Calories

After accounting for fat and protein, remaining calories come from carbohydrates—approximately 268 grams (1,073 calories) in this example.

Carbs provide workout energy while supporting sleep quality through insulin’s effect on tryptophan conversion to serotonin, then melatonin. Sleep quality often determines diet adherence success, making carbohydrate timing crucial.

Training Protocol: Low Volume, High Intensity

Midtbø’s weight training approach contradicts typical high-volume fat loss programs.

• Two warm-up sets per exercise
• Two working sets per muscle group
• Seven reps close to failure
• Three to five minutes rest between sets

For chest training, that might mean two sets of dips followed by two sets of incline bench press—nothing more. Back training follows the same pattern: two sets of rows, two sets of weighted pull-ups.

This minimalist approach serves multiple purposes during calorie restriction. Lower training volume reduces fatigue, prevents excessive hunger, and allows better sleep—all critical factors when maintaining a deficit long-term.

If I went higher on the volume, I got more tired throughout the day. And the volume also increased my hunger, so I had a harder time to get to sleep.

Full-body sessions three times weekly (Monday, Wednesday, Friday) provide sufficient stimulus without overtaxing recovery capacity. The key message to muscles remains clear: we need you, so don’t break down for energy.

Walking: The Secret Weapon for Sustainable Fat Loss

Midtbø calls walking “the special sauce” and “the main lever” for fat loss—and backs up that claim with compelling reasoning.

The 10,000-Step Minimum

Starting with 10,000 daily steps, the protocol progresses toward 12,000-15,000 steps as a target. Depending on body size, 10,000 steps burns 300-700 calories—modest numbers that hide walking’s true power.

Unlike intense cardio, walking imposes minimal physical stress. You recover overnight and repeat daily without accumulation of fatigue. This creates consistent, predictable calorie expenditure around which routines can be built.

Psychological and Social Benefits

What began as a dreaded obligation transformed into Midtbø’s favorite part of each day.

I took long walks with my friends, checking in on them, how they were doing in life, having long and important conversations that I would never have had if I hadn’t done the walking.

Weekly phone calls with distant family members, time for personal reflection on shortcomings and gratitude, deep conversations with friends—all occurred during walking sessions that made 10,000-20,000 steps feel effortless.

Metabolic Advantages

Walking demonstrates remarkably low impact on hunger despite substantial calorie burn. This allows aggressive step counts (12,000-15,000) without triggering compensatory eating—a critical advantage over higher-intensity cardio.

Morning walks set circadian rhythm, improving energy throughout the day and sleep quality at night. Better sleep drives better adherence, creating a positive feedback loop.

Midtbø discovered an ingenious hack for accumulating steps: pacing during gym rest periods added 7,000-10,000 steps per session without additional time investment.

Meal Timing: Finding Your Optimal Window

Experimentation revealed that meal frequency dramatically impacts energy levels and adherence.

Three meals daily left Midtbø unsatisfied with small portions and experiencing carbohydrate-induced energy crashes. Two meals improved the situation, but one meal per day proved optimal for his lifestyle.

Saving all food for a single evening meal after training provided several advantages:

• Psychological satisfaction from a substantial, filling meal
• Improved sleep quality from concentrated carbohydrate intake before bed
• Stable energy throughout the day without carbohydrate fluctuations

However, extended fasting requires consideration of potential hormonal effects and additional physical stress. Electrolytes become crucial—salt in water maintains proper mineral balance during fasting windows.

There are more and more studies coming out that your body can utilize more than 100 grams of protein in one sitting. The important part is you gain the right amount of protein per 24 hours.

Midtbø maintained significant muscle mass despite one meal daily for six months, supporting research on protein timing flexibility.

Understanding Metabolic Adaptation

Skeptics claimed Midtbø’s metabolism would “crash” during prolonged dieting, halting weight loss entirely. Instead, he lost 28 kilograms over 15 months by understanding and countering adaptive mechanisms.

How Your Body Fights Back

Metabolism functions as a chemical engine running constantly—powering heartbeat, breathing, thinking, movement. More movement and muscle mass demand more daily fuel.

During prolonged calorie deficits, your body systematically reduces energy expenditure through subtle, often unnoticed changes:

• Eliminated hand gestures while talking
• Reduced spontaneous movement during sedentary activities like video editing
• Increased phone scrolling and sitting time
• Loss of unconscious fidgeting and foot tapping

These adaptations can collectively reduce daily expenditure by 500 calories—enough to stall weight loss completely.

Countermeasures That Work

Awareness enables intervention. Midtbø implemented practical strategies:

• Setting phone timers for planned sitting periods
• Consciously moving while talking and working
• Seeking social support for gym energy and motivation
• Maintaining 12,000-15,000 daily steps to offset metabolic slowdown

Walking provides built-in protection against adaptation—consistent activity prevents extended sedentary periods where energy conservation dominates.

Debunking the Age-30 Metabolism Myth

Man, just wait until you’re 30. That’s when you really start to gain weight.

Midtbø believed this common wisdom until examining his own experience. At 34, he gained significant weight for the first time—not due to metabolic decline, but lifestyle changes reducing daily activity.

His average steps dropped to 3,000 daily. Training frequency decreased. Career and family responsibilities created a more sedentary lifestyle while eating habits remained unchanged from more active years.

Research confirms metabolism remains stable until age 60, declining only about one percent annually thereafter. Weight gain in the 30s reflects activity reduction, not metabolic collapse.

Week One: What to Expect

Proper protocol implementation should yield approximately one kilogram loss in week one.

This rapid initial drop reflects glycogen depletion before fat mobilization begins. Glycogen stores significant water, creating dramatic scale changes when depleted.

By week three, expect weight loss to slow to roughly half a kilogram weekly—a sustainable, manageable deficit for most people. Those wanting continued one-kilogram weekly losses should increase walking and general activity before reducing food intake.

Food supports vitamins, minerals, muscle building, and sleep—optimize activity first, then adjust calories if necessary.

No weight loss despite full protocol adherence suggests calories need reduction by approximately 500. Midtbø considers this scenario unlikely and offers personal troubleshooting through comments.

Transitioning to Maintenance: Finding Your Balance

Completing a cut from 80 to 70 kilograms on 2,000 daily calories requires strategic reverse dieting to establish new maintenance.

Increase calories by 400 immediately, bringing intake to 2,400 daily. Additional calories should come primarily from carbohydrates and fat—protein remains at 2 grams per kilogram body weight.

For a 70-kilogram athlete:

• 140 grams protein (560 calories)
• 70 grams fat (630 calories)
• Remaining calories from carbohydrates

Monitor for one week. Gaining approximately one kilogram indicates glycogen and water restoration—not fat regain. No weight gain suggests maintenance lies higher; increase by 200 calories weekly until finding equilibrium.

Expect total weight increase of 1-3 kilograms from muscle glycogen and water restoration. This represents normal physiological recovery, not fat accumulation.

Reverse Engineering for Athletes: Optimizing Performance

Climbers and athletes can use this framework to identify whether they’re chronically undereating—a widespread issue limiting performance potential.

Using the same calculator for a 75-kilogram climber suggests maintenance around 2,682 calories. Macro targets:

• 150 grams protein (600 calories)
• 75 grams fat (675 calories)
• 351 grams carbohydrates (1,404 calories)

Track current intake for one week. Many athletes discover they’re eating significantly less than calculated maintenance—often 2,200 calories when 2,600+ would be appropriate.

Increase by 200 calories weekly until gaining half to one kilogram, indicating true maintenance discovery. This level optimizes recovery, immune function, training quality, and reduces systemic stress.

Strategic Bulking: Four to Five Months Yearly

Midtbø plans annual bulking phases specifically to maximize training adaptations and athletic development.

A 300-calorie daily surplus provides sufficient energy for optimal recovery and intense training without excessive fat gain. Over four to five months, this equals roughly 36,000-45,000 surplus calories—translating to 4-5 kilograms of weight gain.

With established cutting proficiency, returning to performance weight requires under two months. This annual cycle—bulk for athletic development, cut for performance—creates sustainable progression without fear of uncontrolled weight gain.

The Hidden Epidemic: Chronic Undereating in Climbing

Midtbø identifies a pervasive pattern among climbers: maintaining stable weight for years while struggling to build muscle, experiencing slow progress, and accepting limited results as genetic limitation.

When questioned about food intake, most don’t actually know. They assume adequacy based on feeling “fine” and having “good energy”—not realizing their baseline has slowly degraded over years.

The Downward Spiral

A typical trajectory: initially burning 2,500 calories daily, gradual food reduction coupled with increased training triggers metabolic adaptation. Energy expenditure drops through reduced spontaneous movement, increased illness frequency, and generally lower vitality.

I was always sick. I had low energy. I could not deal with tension when I climbed. That required too much energy physically and mentally. So I just started campus everything. That became my style.

Midtbø’s experience ten years ago mirrors countless climbers today. What feels like personal climbing style often reflects energy-conserving adaptations the body imposes, not conscious choice.

Operating at 70% capacity becomes the new normal. Progress measured against this diminished baseline creates illusion of adequate performance while never approaching true potential.

Breaking Free: The Power of Adequate Fuel

Climbers worldwide report transformative results from simply eating more—dramatic progress previously thought impossible.

The mechanism is straightforward: for the first time, they reach full training potential and sustain it long-term. Consistent, high-quality training sessions compound into remarkable adaptations.

Midtbø’s protocol removes fear of weight gain by providing clear, actionable steps for losing fat when desired. With that fear eliminated, athletes can confidently fuel performance without anxiety about body composition consequences.

Key Principles for Long-Term Success

Successful implementation rests on several foundational concepts:

• Calorie calculators provide starting points, not absolute truths—individual testing determines accuracy
• Macro targets prioritize hormonal health and muscle preservation over arbitrary ratios
• Walking creates sustainable calorie deficits without excessive hunger or fatigue
• Low-volume, high-intensity training preserves muscle during extended deficits
• Meal timing should optimize sleep quality and daily energy patterns
• Metabolic adaptation requires active countermeasures—awareness and movement
• Reverse dieting prevents rebound and establishes new maintenance
• Most athletes undereat chronically, limiting performance potential

This framework removes guesswork from body composition management. Whether cutting for health, maintaining for performance, or bulking for development, the same principles apply with adjusted implementation.

Midtbø’s 28-kilogram transformation demonstrates that sustainable fat loss doesn’t require suffering, extreme restriction, or sacrificing athletic performance. It requires understanding, consistency, and strategic application of evidence-based principles.

For climbers and athletes, perhaps the most valuable insight is permission to eat adequately—fuel that unlocks training potential previously constrained by chronic energy deficiency disguised as discipline.