If Coke is your only option, sure, but I've never seen a doughnut so terrible that I'd take a coke instead.
Sugar does not produce major swings in blood sugar levels unless you're diabetic. Have a working pancreas? Good, then sugars are a perfectly healthy source of calories which your system will merrily mop up into glycogen. Anyway, starch produces a larger insulin response than sugar, so the sugar phobes are laughably ignorant on this count.
As for your concern with nutrients, the fact is an adult male needs 2400+ calories a day. Protein and other nutrient needs are very easily met with some servings of foods such as eggs and milk and potatoes, still leaving a large calorie deficit. Sugar is a perfectly viable way to add four hundred or so calories to your daily diet. Sugary fruit is best, but high quality perfectly ripe fruit is surprisingly difficult to find. Low quality, unripe fruit has many allergens and toxins. In this context sugar is a very good choice.
Personally I daily have about 12 tsp of sugar (in coffee) and a coke. I'm shredded, btw.
1 big mac 540 calories, 1 large fry, 500 calories 1 large Coke 32 oz 310 calories total
Snacks can add up surprisingly quickly so if you do have a shortfall I'm not sure it's necessary to resort to eating sugar. For example, 2 bananas and a tin of salmon will be something like 500 calories. That's 20% of your budget right there.
That's what I was like too, before I turned 25. That's just how it goes, independent of your diet (within reason).
1) He wasn't advocating for either.
2) Coke doesn't have sugar. It has HFCS. So your comparison should be - commercial dough deep fried in corn oil over water with coca leaf flavoring and corn oil.
3) I'm sure lots of books say males need 2400+ calories a day. They are probably wrong. Just as "breakfast is the most important meal of the day" is wrong. There's plenty of studies that say that second hand smoke isn't bad for you. But these studies are from the early 90's and subsidized by tobacco companies.
Besides, I don't have to know what I'm talking about as I can go read actual data. Coke has a glycemic rating of 63 (http://www.health.harvard.edu/newsweek/Glycemic_index_and_gl...) - this list doesn't include donuts and yes, you are correct that things like white bread are actually higher than a Coke but if we take iced vanilla cake as a proxy for a donut the glycemic rating is 44. So yes, to me that seems preferable. Even better would be actual food which is why I don't get most of my nutrition in remote gas stations.
Most people, particularly most biologists and health-care practitioners, would disagree with that.