Why is it so low at the moment?

Having tried to introduce a lot more wholemeal foods into our diets at the moment I would have expected my blood sugar to be much higher. However looking back into what I've been eating lately I've realised that not only have I been making smaller portions, I have also been missing out on some of my snacks. I do find that if I don't have a snack in the middle of the afternoon, and a decent supper before bed that it does have a big impact on the way I feel. Does anyone else feel the same?