I concur with some of the above statements-
-Do you wanna be big and muscular? If you want it enough,not only wil you shut up and lift,you will shut up and eat.
-If you don't wanna be huge,and are happy with a lean,riped look,then stick with it and work on that.
-If you decide you wanna be bigger,then try introducing more variety in your diet.experiment with different spices,cooking styles,etc.
-If you are naturally lean,you won't need to be as strict as many have to be anyway,so enjoy!
-Are you taking a probiotic/prebiotic pill or drink? I take 2 a day,really helps me with digestion now that I'm puting away almost 4,000 cals.
-I found it hard at first,but easier now.I would imagine that since muscles get stronger if you train them regularly or at least muscles adapt due to constant strains/stresses,it stands to reason your digestive muscles would get stronger or adapt.
-Too many people up their total calories/protein/carbs without upping the amount of fibre they eat,have you looked at how much fibre you are taking in?
-It may be possible you have a food allergy/intolerance.You do not need to see a doctor-There is a very simple way to test yourself for this-take one food out of your diet for two weeks,monitor how you feel,then reintroduce it-if you have an intolerance/allergy you will know very soon after eating it for the first time-
the symptoms will be more obvious as your body has had a break from it and hasn't had to deal with it on a daily basis (usually you will get stomach pains or diarrhoea if you reintroduce a food that doesn't agree with you) there are tens,if not hundreds of thousands of people with undiagnosed allergies/intolerances.
Some of the most common foods that cause negative reactions are wheat/milk/soya/eggs/gluten.
-You might want to read up on acid/alkali foods,eating alkali foods help maintain a positive PH balance,which helps digestion and recovery,among other things.The short version is simply to eat a portion of alkali food with every acid food.Acid foods are most grains-rice,wheat,etc. and all meats and eggs.
Alkaline foods are Vegetables including potatoes (very alkali) and fruit.