Re: sugary products straight after meals - bad?
It doesn't 'interfere' with any digestion of nutrients or anything.. the only thing is if you are trying to lose weight or something, it might put you over your calorie limit for the day. However like Sammy says, it's like dessert..
If you are worried, why not try to 'kill' your cravings by making the flapjacks actually FOR dinner, just a healthier version. From what I know, flapjacks are like crepes or pancakes right? So, try filling them with ricotta or cottage cheese, and lots of fruit. It's like a blintz then, kinda. My family makes those every so often for dinner...
You could also try different kinds of 'sweet' to satisfy your craving. For example, why not have fruit with a lil cool whip or sugar ontop as a dessert, or a fruit sauce with your dinner (on your meat or something), or even a sweet drink, like flavoured water, juice, even a diet pop every so often. Of course, I understand the power of a craving, so the flapjacks aren't completely horrible.. if you eat healthy the rest of the day, you more than deserve them! (Just a thought, but I always find that I crave things most when I have some sort of 'deficiency', like not enough salt, carbs, protein, water, or even not enough to eat in general!)