Well i guess you know its more or less down to diffs between t1d and t2d.
Types 1 after a pizza would a high blood sugar and have to take extra insulin to get it back to normal
Types 2 pancreas still functions producing basal insulin levels until glucose rises from a carb load. However while insulin ( i think, its a long time since i looked at this stuff) transports glucose from the blood to cell surface insulin receptors, defects in an ancillary cell surface protein expression, Cd36, are thought to account for impaired insulin receptor sensitivity to glucose metabolism through alterations in internal cell signalling causing insulin resistance recent studies have shown (
http://diabetes.diabetesjournals.org/content/67/7/1272).
Whats intetesting about all that is the reversability of type 2 diabetes with restoration of a optimal bmi weight. I dont know if such reversal is a universal possibility, but if so it suggests a stored fat sensitivity by cd36, potentially to stop the body puttting on more weight ( no reference to yourself), although thats my speculation. If its not a universal possibility that bmi recovery reverses t2d, its suggests more than one mechanism operates to cause t2d. This may be well known already. T2d was never really my area being a t1d.
Your situation with insulin production and correction of hyperglycaemia suggests functional insulin receptor clearance if glucose and by inference functional cd36 suggesting more than one mechanism.
Ps if half your plate was full of nice salad, you'd eat half as much pizza

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Nice salads
Thinly sliced fennel, hard goats cheese shavibgs ( sainbroids) , parsley. Tbspn pomegranite seeds. Bit of crusty bread and butter. Table spn olive oil, tspn vingar. Salt and pepper. Glass white wine.
Or
Rocket
A few broken up tinned anchovies
Black olives
Dressed as previous salad
Boiled egg cut in 1/4s or 1/6ths
Or
Lettuce
Blue cheese bits
Sliced apple/ pear/ quincechopped a little1 clove crushed and chopped garlic
Tbspn hair thinly sliced onion
Parsley - flat sort has more flavour
Usual dressing
Or
Ripe tomatoes roughly chopped
Orange, peeled and sliced into disks
Tbspn washed chopped a lityle fresh mint leaves
Tbspn toasted pine nut
Usual dressing although i pressure to use cider than wine vinegar with this one.