Sometimes I notice that I get really tired after a workout or it gets really late in the day, so I skip my PPWO meal and just have my casein shake before bed (I have a PWO meal - chicken & rice , then PPWO - tilapia & olive oil, then before bed - casein shake & PB).
The meal I skip sometimes is only 260 calories though (a pro/fat meal), so I never viewed it as to detrimental because I don't skip it a lot, but still ... mentally it throws me off because I'm not arriving at my caloric intake goals.