I don't know if I am wheat intolerant, but my low carb diet removes most of the wheat.
For b'fast I have an almond porridge which I find very sustaining. I have simplified the recipe so that it can be made in a mug with mixed powder & boiling water:
3 dspoons ground almonds
2 dspoons coconut powder
1 dspoon milled flax seeds
mix roughly & pour on boiling water, stir, add more water if needed - if it's too runny, just drink it
The basic recipe provides about:
320 kcals (About 1/5 of your daily requirements)
6.5 g carb
10 g protein
32 g fat
7.5 g fibre
For variation, I sweeten with NAS squash, or add oat bran, cup-a-soup, low cal chocolate, dried milk, etc.
For a snack or meal replacement when out, take the dry mix in a screw top container & tip some into a cup to be topped up with boiling water.
In comparison a "healthy" muesli (45 g) provides:
232 kcals (About 1/8 of your daily requirements)
36 g carb
9.3 g protein
5.3 g fat
3.5 g fibre