I personally train upper body in the AM (fasted) followed by Porridge (70g) mixed Greek Yoghurt (100g) and Whey Isolate (15-20g) and train lower body at 6PM with another Porridge etc 60-90 minutes before, post workout I have a Jacket Potato immediately after followed by sweet potato, chicken etc about 45 minutes later - whether this is optimal in terms of insulin spikes I will let others pass their comments.
These is the only times I eat carbs all other meals during the day (5 more meals in total) are protein and fat based with carbs as incidentals.