I take in oats and whey in the morning. whey shake first, then eat oats. I have a few fish oil caps, some sesamin and CLA for fat. I noticed when I mixed natty pb with the oats, I got bloated, and it delayed me from being hungry for my next scheduled meal. Led to a little fat retention and water weight.
REASON: in the morning, we are fasted form sleeping....blood glucose is low. Getting fast acting protein in you plus some whole complex carbs helps reverse this potentially catabolic situation. Fat just slows down the process. I would imagine insulin sensitivity is higher in the morning, so the body can quickly replenish glucose and glycogen. I know that Insulin + fat = body fat. I've opted against significant fat for brkfast, and have been pleased since.