First up: what is best?

As a rule, grainier = greater. You can rely on whole grains to stop any mid-afternoon hunger pangs. Look out for a carb-to-fibre ratio of 10:1 on the label.

Leave the Lurpak and mash in an avo – its healthy fats ramp up vitamin absorption.

What about the filling? I guess fish fingers are out?

There are much better ways to pack in the protein . Try roast beef or turkey breast.

Any veggie options? I’m on meat-free Monday.

Easy. First, spread a plant-based pâté or dairy-free cheese, then add mashed black beans. Or alternate slices of tofu with tapenade, salad and tomatoes.

Finally, here’s a top tip: avoid a soggy sarnie by adding your tomatoes at the last minute!

Today 12.08pm

This is the best thing since, well, sliced bread.

Alex Parker, dietitian at the Biting Truth