I'd encourage you to investigate nutritional causes of your dad's problems. You can read Seven Weeks to Sobriety, by Joan Mathews Larson. She's got a website that you can look at.
Joseph D. Beasley M.D. (a recovering alcoholic) also has several books on the subject.
Some studies indicate almost all (80-90%) alcoholics are hypoglycemic, and the symptoms you describe could be related to that. Craving sweets is common with recovering alcoholics. One woman in a meeting told of eating BAGS (the big ones) of M&Ms per DAY. But eating candy to deal with low blood sugar and new cravings for sweets (what I was told in AA) just feeds the problem instead of resolving it.
Others suffer from severe nutritional deficiencies, especially just after quitting. Our diets while drinking are terrible and alcohol destroys our ability to absorb nutrients that we do consume. Vitamin B deficiencies are common. Bill W. (co-founder of AA) recommended Niacin as a wonder drug for sober alcoholics suffering from long term depression, as he did for many years after quitting.
We call alcoholism a "disease" and then ignore any physical issues related to it. telling people who quit to white knuckle their way back to health. It's a crime, in my opinion, not to investigate and try the alternative approaches. At worst you waste some money on vitamins and get him on a better diet, which should help if even by accident.
For myself, I was drinking half a liter per day, plus 3-5 beers, had suffered two withdrawal seizures, and cleaning up my diet, eliminating sugars, a long term program of nutritional supplements and exercise has made recovery virtually painless and craving free.
Just to be clear, AA and Al-Anon are tremendous. For me, the two (AA and lifestyle changes) together have been the ticket to long term, stable, relatively happy sobriety.