Macro Tracking While Injured: How to Eat When You Can't Train

TL;DR

• Muscle loss during immobilisation is fast: roughly 0.5-1.5% of limb muscle mass per day in the first week, then it slows.
• Don’t crash diet. A deficit deeper than about 500 kcal below maintenance measurably slows healing and accelerates muscle loss.
• Push protein up, not down: 1.6-2.5 g/kg bodyweight per day, spread across 4-5 feedings of 0.3-0.4 g/kg.
• Your maintenance drops less than you think. Healing tissue is metabolically expensive, and a fractured limb can raise resting energy expenditure by 15-20%.
• Track loosely but consistently. The goal for the next six weeks is not a physique change, it’s arriving at your first rehab session with your muscle intact.

Why the instinct to cut is wrong

The logic feels airtight. You were burning 600 kcal a session, five sessions a week. Now you’re on the sofa with your leg in a boot. Cut 600 a day, stay level, no harm done.

Two problems with that.

First, structured exercise is a smaller share of your daily burn than the tracker on your wrist suggests. For most recreationally active people, deliberate training accounts for 10-20% of total daily energy expenditure. The bigger loss when you get injured is NEAT: the walking, fidgeting, stair-climbing and general moving about. That can drop by 200-400 kcal a day on its own, and it happens whether or not you touch your macros. If you’ve never worked out what your baseline actually looks like, calorie deficit explained is the place to start before you touch anything during recovery.

Second, and more important, healing is not free. Bone repair, soft tissue remodelling and the inflammatory response all cost energy. Research on fracture patients has found resting energy expenditure elevated by 15-20% above baseline in the acute phase, with severe trauma and burns going considerably higher. So your maintenance falls, but not by the full amount you removed from your training log.

The practical version: estimate your new maintenance as roughly 10-15% below your pre-injury number, not 25-30%.

The protein case, which is the whole ballgame

Immobilised muscle develops what researchers call anabolic resistance. It stops responding properly to protein. The same 25 g dose that would have triggered a decent muscle protein synthesis response in a trained limb produces a blunted one in a limb that hasn’t moved in ten days.

The response to a less sensitive system is a stronger signal, not a weaker one.

How much

Aim for 1.6-2.5 g per kg of bodyweight per day. If you sat at 1.6 g/kg while training, move towards 2.0-2.2 g/kg while injured. An 80 kg person is looking at 160-175 g a day. If those numbers feel arbitrary, how much protein do you actually need per day walks through where the ranges come from.

That is a lot of protein for someone who isn’t hungry, which is the honest difficulty here. Appetite often drops during injury, partly from reduced activity and partly from painkillers. Liquid protein helps: a shake with milk gets you 35-40 g without much chewing or enthusiasm, and it’s worth knowing which protein powder type suits low-appetite days versus your usual post-workout shake.

How to spread it

Four to five feedings of 0.3-0.4 g/kg each. For that 80 kg person, that’s 25-32 g per sitting. Even spacing beats the classic pattern of 15 g at breakfast, 20 g at lunch and 90 g at dinner, because muscle protein synthesis responds to each stimulus separately rather than to a daily total. There’s more on why timing matters, not just totals, in protein timing and distribution.

If you only change one thing during your recovery, make it breakfast. It’s the meal people most reliably under-protein, and it’s the longest gap you’ve got. A few high-protein breakfast ideas that don’t need much prep are useful here, since cooking effort tends to drop along with everything else during recovery.

Leucine and the usual supplements

Leucine is the amino acid that flips the switch on muscle protein synthesis, and the threshold for the response is around 2.5-3 g per meal. Whey, dairy, eggs, meat and fish all clear it comfortably at a 25-30 g protein serving. Plant proteins are lower in leucine, so if you’re vegan, run the higher end of the protein range and lean on soy and pea blends, and check vegan high-protein meals for combinations that hit the threshold without animal sources.

Creatine is worth continuing or starting at 3-5 g a day. The evidence on creatine preserving muscle during immobilisation is mixed rather than conclusive, but it’s cheap, safe and the downside is essentially nil. Creatine 101 for macro trackers covers dosing and what it does and doesn’t do.

Collagen with vitamin C has modest evidence for tendon and ligament support, in the region of 15 g gelatin plus 50 mg vitamin C about an hour before rehab exercise once you’re moving again. Treat it as optional, and note that collagen is poor-quality protein for muscle purposes. Count it separately from your protein target, not towards it.

Setting your actual numbers

Here’s the sequence I’d use.

Work out injured maintenance. Take your pre-injury maintenance and cut 10-15%. If you were eating 2,600 kcal to hold weight, call it 2,250-2,350.

Decide your goal honestly. For most injuries lasting under eight weeks, maintenance is the right call. If you’re carrying weight you genuinely want to lose and the injury is long-term, a modest deficit of 250-400 kcal is defensible. Deeper than 500 kcal below maintenance and you’re trading healing speed for scale movement, which is a bad trade when you’re already sidelined. Worth reading why the scale goes up in a calorie deficit too, since water retention from inflammation and reduced activity will confuse the number on the scale regardless of what you eat.

Set protein first. 2.0-2.2 g/kg, locked. This is not the flexible number.

Set fat next. 0.8-1.0 g/kg for hormonal function and to keep meals satisfying when volume is low.

Carbs fill the rest. They’ll be lower than usual because you’re not training, and that’s fine. Don’t go near-zero: carbohydrate spares protein for tissue repair rather than fuel, and glycogen matters again the moment you start rehab.

Fibre deserves a mention. Reduced movement plus opioid painkillers is a reliable recipe for constipation. Keep fibre at 25-35 g a day and drink more water than feels necessary. Understanding fibre and why it matters for your macros has the detail if this isn’t a macro you normally track.

Tracking when you can’t be bothered

Motivation drops when there’s no training to feed. That’s normal and you should plan for it rather than pretend otherwise. It’s a milder version of the same drop-off covered in common macro tracking mistakes and how to fix them, where inconsistency, not the wrong numbers, is usually what derails people.

Lower the friction. Photograph meals and let the app estimate rather than weighing every ingredient. Precision matters less at maintenance than in a deficit, because there’s no aggressive target to overshoot. Chowdown’s photo logging exists exactly for the days when opening a food scale feels like a project.

Use repetition. Three fixed breakfasts and three fixed lunches on rotation removes most of the daily decision load, and you already know their macros.

Track a streak, not a physique. There’s no visible progress to reward you for six weeks, so the metric has to be adherence itself. Logged the day, hit protein, done.

The first month back

When you’re cleared to train, the temptation is to immediately cut, because the mirror has an opinion about the last six weeks. Resist it for four weeks.

Rebuilding lost muscle is faster than building it new, thanks to retained myonuclei, but it still requires calories. Come back at maintenance or slightly above, keep protein high, and let training do the recomposition work. Cut after the strength has come back, not before. If recomposition is the actual goal once you’re back on your feet, body recomposition: build muscle, lose fat is the natural next read.

The people who recover well are almost always the ones who were boring about protein while they were sitting still.