I don't know if I should tell him. Snack whenever you feel a little hungry. You don't need big meals. The fullness feeling will be less that way. Don't underestimate the importance of this, for many reasons.
Probiotics are mandatory to help the digestive process.
This will cause you to feel less full for less long. I'd recommend digestive enzymes be considered, like Super Enzyme by NOW, 1-2 right after meals. Make sure your fianc knows. I'm very careful and I eat a very low-cholesterol diet. Even if you eat absolutely ZERO cholesterol your body will manufacture it, as it's a vital molecule for many bodily functions, especially hormone production.