There actually is science behind the recommendations for frequent, small meals, oppsed to eating three large meals. This is particularly true early in the adaptation period or if you continue to have issues with a rapid gut transit time.
First of all, the bigger the meal, the more time it takes to digest. Early in the adaptation period for mostly everyone, and indefinitely for some, the gut transit time is too fast to digest food well enough. If you find you are not able to gain or maintain your weight, this can be the primary problem. Better digestion also means better absorption of nutrients, including vitamins and minerals. Even for weight loss this type of eating is recommended, because you don't get hungry, which is a temptation to overeat.
Second, when the gut is healing, having a nearly constant stream of food in it is beneficial because the food gives something for the bacteria to work on, other than your intestinal walls. So you are less likely to suffer with IBS type symptoms of increased cramping and such. The presence of protein and fat also slows the gut, and you are more likely to have a more consistent function, instead of periods of diarrhea and cramping followed by a quiet gut.
This is highly individual and you have to experiment with what works for you. There is no one right way. Some people get by fine eating one meal a day. But, as said before, early in the adaptation period or if you are having functional problems or are unable to keep weight on, small frequent meals are recommended.
Jan