How to eat enough protein when you have no appetite

Sixty people on these drugs kept a three-day food diary. Forty-three percent of them reached 1.2 g of protein per kilogram, which is the bottom of the range. Ten percent reached 1.6. Five percent reached 2.0.

That is not a compliance problem. Ninety percent of a group actively trying to lose weight, under medical supervision, missing the target that protects the thing they least want to lose. Something structural is wrong with the advice.

Why that target protects anything is a separate argument, and a more interesting one than the panic suggests. This page is about hitting it.

The size of the gap

The same study put numbers on it. Men averaged 88 g of protein a day against a calculated need of 135 g at the 1.6 g/kg target. Women averaged 74 against 104.

So the typical shortfall is somewhere between 30 and 47 g a day. That is not a rounding error you close by adding a boiled egg. It is a whole additional meal's worth of protein, to be eaten by somebody who does not want to eat.

Worth noting what those targets were calculated against: adjusted body weight rather than current weight, which is standard practice once someone is above roughly 115 percent of ideal bodyweight. The fat mass does not need feeding. Using current weight inflates the target and makes an already hard number impossible.

Why protein is the thing that disappears

Appetite suppression does not reduce all foods equally. It reduces the appetite for food that takes work.

Protein-dense food is chewy, slow, filling and usually requires cooking. Carbohydrate arrives soft, sweet and pre-made. When the drive to eat is turned down, what survives is whatever needs least effort, and that is almost never the chicken.

The day drifts. Coffee. Half a croissant at eleven because something should be eaten. A few spoonfuls of a meal at eight that felt fine on the plate and impossible by the third mouthful. Total protein for the day: under 40 g, in a person who needs three times that.

No decision was taken anywhere in that day. That is the point.

The part almost nobody explains

Here is where the standard advice goes wrong, and it is not about the total at all.

Muscle protein synthesis does not respond to protein arriving in a steady trickle. It responds to a threshold being crossed. The amino acid that does the switching is leucine, and the muscle needs roughly 2.5 to 3 g of it in one sitting before it starts building. Younger muscle sits nearer the bottom of that range and older muscle nearer the top, which matters later on this page. Below the threshold, the protein is still digested and still used, but as fuel and raw material rather than as a signal to keep muscle.

Which means the unit that matters is not grams per day. It is how many times a day you cross the threshold.

Three meals of 15 g of protein is 45 g that does very little for lean tissue. One meal of 30 g plus a shake of 30 g is 60 g that crosses twice and does considerably more. Same food diary, different outcome, and the daily total barely moves.

Nobody on a suppressed appetite is managing four meals of 30 g. So the honest question stops being how do I hit my target and becomes how many threshold crossings can I realistically get, and how do I make each one count.

Not all protein carries the same leucine

This is where source stops being a detail.

Whey is roughly 10 to 12 percent leucine by weight, which is about as dense as practical protein gets. A 30 g serving of whey clears the threshold comfortably. Plant proteins generally run 6 to 8 percent, so the same 30 g may not.

On a normal appetite that difference is academic, because you simply eat a bit more. On a suppressed appetite, where the constraint is volume rather than willingness, it decides whether the meal did anything for your muscle or not.

The practical consequence is uncomfortable for people who would rather not use supplements. A whey or whey-casein shake is not a shortcut. In this specific situation it is often the only vehicle that delivers a threshold-crossing dose in a volume a suppressed stomach will accept.

Age moves the threshold up

Older muscle shows anabolic resistance, which means a blunted response to the same dose. Compensating takes either more leucine per sitting, above 3 g, or more total protein per sitting, in the region of 35 to 40 g.

So the 55-year-old private client needs a bigger single dose than the 30-year-old to get the same signal, while having, on average, less appetite to deliver it with. Those two facts point in opposite directions and the gap between them is most of my job.

Front-load the day

Most of my private clients describe the same daily shape: eating is easiest in the first hours after waking and hardest in the evening. I should be straight that this is what I see in front of me rather than something the literature has established, so treat it as a pattern to test on yourself.

Where it holds, the consequence is severe and simple. A threshold crossing missed at breakfast is not recovered at 9pm. By then the appetite is gone and the food is unappealing, and no amount of discipline produces a second dinner.

The first meal stops being optional and stops being a croissant. It becomes the meal that carries the largest single dose of the day, eaten in the window where eating is still possible.

The overnight gap

Sleep is an extended fast. Muscle protein synthesis falls across it, and in somebody already short of protein it falls from a lower starting point.

Pre-sleep casein, in the region of 30 to 40 g, releases amino acids slowly over seven or eight hours and has been shown to raise overnight synthesis in resistance-trained men. It is one of the few interventions that does not compete with appetite, because it goes in at the point in the day when nobody was going to eat anything anyway.

The evidence for it comes from trained populations rather than from people on GLP-1 drugs, and I will not pretend otherwise. But of all the things on this page it is the one with the lowest cost to trying.

Making it physically possible

The instinct is to put more on the plate. The plate is the problem.

• Liquid protein works when solid food does not. It bypasses the mechanical half of the problem and delivers a threshold dose in a fraction of the volume.
• Cold protein is often tolerated when hot is not. The usual explanation is that heat carries smell, and there is no good evidence behind that, but the pattern comes up often enough to be worth trying.
• Fewer, larger doses beat grazing. This runs against the usual small-and-often advice, and it follows directly from the threshold: two proper crossings beat five sub-threshold snacks.
• Dairy, eggs and fish tend to hold up better than red meat, which is the densest and slowest thing on the list.
• Anything requiring 40 minutes of cooking will not be cooked. Plan around the version of yourself that is not hungry, not the one writing the shopping list.
• If constipation is what is stopping you eating, fix that first, because the usual advice for it is aimed at the wrong problem.

The training half, briefly

In the same study of sixty, only 53 percent reported exercising more than before starting the drug. Just over half. And exercise habits showed no significant relationship with how much protein or how many calories people were eating, which suggests these are two separate failures rather than one.

Protein without loading is a signal with nothing to act on. Loading without protein is a demand with nothing to meet it. Neither half works alone, and on current evidence most people are doing neither.

The shopping list is the intervention

I write shopping lists for private clients and it is not an administrative nicety. A plan that requires a decision at 7pm in a supermarket, made by somebody with no appetite and no interest in food, is a plan that will not happen.

The decisions get made once, in advance, by somebody thinking clearly. Then the week runs on what is in the fridge.

One sentence to take away

Nobody fails this for want of willpower. They fail it because they were handed a daily gram target, no method for reaching it, and no explanation of why three small protein meals do less than one proper one, at the exact moment their body stopped helping.