To me, the bloating is caused by different things - not necessarily what food I just ate.
1) Being C. No matter what I've eaten, if I haven't gone enough (or at all) that day, I am going to bloat up - I just get bigger and bigger with each meal. And, conversely, when I do go in a big way (sorry), my tummy is way flatter.
2) Eating a food that is gas-causing. That's somewhat of an individual thing. It doesn't seem like you ate much today (I'd be starving) but for me, the toast would be the culprit since wheat bloats me. But that's just me.
3) Trapped gas still inside me from the day before - i.e. from last night's meal.
4) Swallowing air. If my guts are all spasmed up, even a long conversation with someone can cause me to gulp air. And sometimes if i'm in a ton of crampy pain, i'll keep swallowing unintentionally as a reaction to the pain, causing bloat/gas on top of the cramps. FYI, eating too fast, chewing gum, smoking, slurping hot liquids, drinking out of a straw or water bottle, and of course carbonated bevs are all IBS no-no's for this same reason - swallowed air.
Fun, fun!
-------------------- IBS-C, lots of spasm and trapped gas.