Well, there are no studies about feeding cooked whole grains (as in the gloop)per se but there are lots of studies feeding grains processed with heat because of all the studies/tests on pellets which are made of just that and conducted by the avian nutritionists that put together the pellets formulas (starting in the early 80's with the famous Roudybush studies - and I am sure that Harrison's and Kaytee have both quite a number of them, too).
I don't know about the PH of nuts changing in the body, I could only find something on fruits going from acid to alkaline but nothing on nuts. In any case, I've been doing a bit of research on this and I am not convinced at all that the actual PH of food before you eat it has any importance on a normal diet because everything I have found says that the concept of an alkaline diet been healthy is based on incorrect information as chyme (food and gastric juices that go from the stomach into the small intestine) ends up been super acidic from digestive juices (1 to 3!!) but, as it goes on to the small intestine, bicarbonate ions are released by the pancreas which change the PH making it always alkaline (around 8). Now, there are no studies done on parrots, of course, and I couldn't find a single one done on any kind of bird but there is plenty on humans and some on dogs, and, of course, there is the knowledge we have of our own digestive system. But, all in all, everything I've found says that a healthy body will balance out the PH on its own regardless of whether the diet is acidic or alkaline. See below:
http://www.quackwatch.org/01QuackeryRel ... oral2.html
http://www.medicinalfoodnews.com/vol04/ ... cidity.htm
This one actually talks about the benefit of eating alkaline food in order to maintain a balance with very acidic food (which is, mostly, animal protein) but it refers specifically to people who eat diets of virtually only meat and grains and no produce.
http://www.fredericpatenaude.com/blog/?p=1942
These two (part 1 and part 2) are from Chris Kresser:
http://chriskresser.com/the-ph-myth-part-1/
http://chriskresser.com/the-acid-alkaline-myth-part-2/





