Steamed Mediterranean Fish: A Light, 36g-Protein GLP-1 Dinner

When you want a dinner that is light, clean and high in protein, it is hard to beat steamed white fish done well. This Mediterranean version steams a fillet with cherry tomatoes, olives, garlic and herbs so it takes on all those sunny flavours, delivering a lean 36g of protein for just 320 calories. It is fresh, virtually fat-free from the fish itself, and ready in under twenty minutes.

A quick word first: I am not a doctor or a dietitian, just someone who lived this. None of these foods or supplements are medication, and if you are on a GLP-1, check anything new with your GP or pharmacist. Right, let us get to it.

For more evening ideas, see my high-protein dinner ideas, and for hitting your protein, how much protein per day.

Why lean white fish is a GLP-1 winner

White fish is one of the leanest, most efficient protein sources you can eat, and this dish makes the most of it.

36g of protein for just 320 calories. White fish like cod, haddock or sea bass is almost pure protein with very little fat, so you get a big protein hit for remarkably few calories.

Steaming keeps it moist and clean. Gentle steam cooks the delicate fish perfectly without drying it out or needing added fat, and lets it soak up the Mediterranean flavours.

Light and easy on the stomach. On a GLP-1, a light, clean protein like this often sits far more comfortably in the evening than something rich and heavy.

Why light dinners suit the GLP-1 evening

One thing the jab taught me is that the evening is often when my appetite is at its lowest and my stomach at its most easily overwhelmed. A big, rich, heavy dinner — the sort I used to eat every night — can feel like too much, sit uncomfortably, and even disturb my sleep. Learning to lean on lighter, cleaner dinners when my appetite is low was a genuine adjustment, and dishes like this steamed fish became a real favourite for exactly that reason.

The clever part is that light does not have to mean low in protein. This dish is gentle and easy to eat, yet it still delivers a full 36g of protein, so I protect my muscle without forcing down a heavy meal I do not want. That combination — light and easy on the stomach, but genuinely high in protein — is close to ideal for a GLP-1 evening. If you find big dinners a struggle now, this is the kind of meal to reach for: satisfying and nourishing without being a slog to get through. It respects your reduced appetite while still doing the job.

The macros that matter

Here is roughly what one serving gives you. Treat these as a guide rather than gospel, since it depends on your exact ingredients and portions:

Approx per serving	Amount
Calories	~320 kcal
Protein	36g
Carbohydrate	12g
Fat	14g
Fibre	5g

The protein figure is the one I watch on a GLP-1. As a rough guide I aim for somewhere around 1.2 to 1.6g of protein per kilo of body weight across the day to protect muscle while losing fat, and I judge every meal by how much of that it contributes. I log meals like this in Cronometer (it is free) so I know I am actually hitting my targets rather than hoping. The first time I tracked properly I realised I was eating far less protein than I thought, so if you have never done it, give it two weeks.

What you need (serves 1)

• 2 white fish fillets (cod, haddock or sea bass, about 150g each)
• A handful of cherry tomatoes, halved
• A handful of olives
• 1 clove garlic, sliced
• 1 courgette, sliced into ribbons
• 1 tsp capers (optional)
• 1 tsp olive oil
• Juice of ½ lemon
• Fresh basil or parsley
• Salt and black pepper

How to make it

1. Set up a steamer, or a colander over a pan of simmering water with a lid.
2. Place each fish fillet on a piece of foil or baking paper large enough to make a parcel.
3. Scatter over the tomatoes, olives, garlic, courgette ribbons and capers.
4. Drizzle with olive oil and lemon juice, and season with salt and pepper.
5. Loosely fold the parcels closed and steam for 10–12 minutes until the fish is opaque and flakes easily.
6. Open the parcels carefully, scatter with fresh basil or parsley, and serve with all the lovely juices.

Adjusting it to your goals

This is high-protein and very lean, and easy to adapt:

Add a carb if you need it. Some new potatoes or a little couscous rounds it out for a hungrier day.

Bake the parcels instead. If you would rather, bake the foil parcels in the oven at 200C for the same time — just as easy.

Add more veg to the parcel. Peppers, spinach or green beans all steam beautifully alongside for extra fibre. See fibre on GLP-1.

The foil parcel: a foolproof way to cook fish

If you find cooking fish intimidating — worried about it sticking, breaking up, or overcooking — the foil parcel method is your answer, and it is genuinely foolproof. You simply wrap the fish and its flavourings in a loose foil or paper parcel and let gentle steam do the work, either in a steamer or in the oven. The fish cooks in its own moisture and the flavours you have added, so it stays beautifully moist and never sticks to a pan. There is nothing to flip, nothing to watch anxiously, and barely any washing up. It is also brilliantly adaptable — change the herbs, the veg and the aromatics and you have a completely different dish each time, from Mediterranean like this to Asian with ginger, soy and spring onion. Because everything cooks together, the fish soaks up all those flavours. For anyone who is nervous about fish, or just wants a clean, low-effort, healthy dinner, the parcel method is one of the most useful techniques to have. It takes the fear out of cooking fish and delivers a perfect result almost every time.

Prep the parcel, steam fresh

Fish is best cooked fresh, but you can assemble the parcels ahead and keep them in the fridge ready to steam or bake when you get in, which makes this a genuinely quick weeknight dinner. It is light enough that leftovers are less of a thing, but any cold flaked fish is lovely in a next-day high-protein lunch salad. A fast, clean option for my meal prep ideas for Mounjaro.

How it fits a full day of eating

At 36g of protein for just 320 calories, this is one of the most protein-efficient dinners in the series, and it makes hitting my target easy without a heavy meal. I still aim for a solid high-protein breakfasts and high-protein lunch, but a lean, high-protein dinner like this is ideal when I have had richer food earlier.

Being low in calories and carbs, it leaves plenty of room in the day, and I can add potatoes or couscous if I need the energy. a protein shake covers any gap after training. This is exactly the kind of light-but-high-protein dinner the GLP-1 evening calls for — my complete GLP-1 guide explains how I plan around it.

No appetite today?

Light, delicate and gentle on the stomach, steamed white fish is one of the very best dinners for a low-appetite evening — it delivers a big protein hit without being heavy or hard to face. Even a small portion banks serious protein. When cooking is beyond you, HelloFresh keeps proper meals coming. More in what to eat with no appetite.

Supplements that pair well

White fish is lean and low in omega-3 compared to oily fish, so I make sure to take Super Omega-3 EPA on days like this. A daily Super Supplemental covers general gaps, and in winter I add Vitamin D3 + K2. The free Lily & Loaf lifestyle analysis matches a routine to your goals.

Frequently asked questions

What is the best fish for this?

Any firm white fish — cod, haddock, pollock, sea bass or coley all work. They are lean, high in protein and take on the Mediterranean flavours beautifully. Frozen white fish is a cheap, convenient option.

Is white fish good for weight loss?

Excellent — it is almost pure protein with very little fat, so you get a big protein hit for very few calories. At 36g of protein for 320 calories, it is one of the most efficient dinners going.

How do I know when the fish is cooked?

It turns from translucent to opaque and flakes easily when pressed with a fork. In a parcel it takes about 10–12 minutes. Do not overcook it, or delicate white fish dries out.

Can I bake it instead of steaming?

Yes — bake the foil parcels in the oven at 200C for the same time. The parcel method works identically whether steamed or baked, and both keep the fish moist.

Can I use frozen fish?

Yes — defrost it fully first and pat it dry, then cook as normal. Frozen white fish is cheap, keeps for ages and is just as nutritious as fresh.

The bottom line

Steamed Mediterranean fish is the light, clean, high-protein dinner the GLP-1 evening was made for — 36g of protein for just 320 calories, gentle on the stomach and ready in under twenty minutes. Light does not have to mean low in protein, and the foolproof foil-parcel method takes all the fear out of cooking fish. Add potatoes or couscous if you need the energy. To match your supplements to a lean, fish-based diet, the free Lily & Loaf lifestyle analysis is a quick, no-pressure check.

The tools I lean on

If you are putting a GLP-1 routine together, this is the order I would do it in, free tools first:

1. Track a fortnight of food in Cronometer so you can see your real protein and calories.
2. Take the free Lily & Loaf lifestyle analysis to find the supplements actually worth buying.
3. Start an Audible trial for something to listen to while you cook or walk.
4. Keep HelloFresh on standby for the weeks cooking from scratch just is not happening.
5. Batch-cook and freeze portions in a set of freezer-safe containers so there is always a healthy dinner a few minutes away.

A bit about me

I am Alan Spicer. I lost around seven stone on Mounjaro and filmed the whole thing, warts and all, on my YouTube channel. Simple, protein-first dinners like this were a real part of how I held onto muscle and kept the weight off.

This article shares my personal experience and general information only. It is not medical advice. Food and supplements support a balanced diet and healthy lifestyle and do not replace it or any treatment prescribed by your doctor. Speak to your GP or pharmacist before making changes, especially while on a GLP-1 medication. Nutrition figures are approximate and will vary with the exact ingredients and brands you use.

Inspired by the kind of fresh, wholefood dinners in the Lily & Loaf evening meals collection. This is my own version, written from my own kitchen.