Here's a few more - some of them are just restatements of @jonathanbailor 's items...
With very few exceptions, if it's dry and it comes in a box or a bag, it's going to be inSANE - that includes all hot and cold cereals, crackers, cookies, chips, all pastas, etc. (The only exceptions to this that I can think of are nuts, flax seeds, chia seeds, coconut flour, almond flour, and protein powder.)
Anything you can buy that's bread, or bread-like, or cake, or cake-like is going to be inSANE - i.e. bread (obviously), "diet" bread, English muffins, regular muffins, "diet" muffins, tortillas (flour or corn), tortilla-like flatbreads, etc.
Almost any beverage that contains more than trace calories is going to be inSANE. (Some sparkling waters are flavored with "essence of" whatever, and they're generally calorie-free - but some are flavored with "juice of" whatever, and they might not be.)
If something's MADE FROM fruit but it's NOT fruit, it's almost definitely inSANE - even if it's 100% natural and there are no artificial ingredients or added sweeteners. This includes dried fruits, "fruit rollups," fruit juices, applesauce, etc. (Ironically, even if the original fruit is SANE, the end product usually isn't - blueberries are SANE, dried blueberries aren't.)
(Similar to the above - if something's MADE FROM meat but it's NOT meat, it may or may not be SANE, but it'll often be kind of nasty :-))
The most frequently-heard piece of food-shopping advice is still the best - "shop the perimeter, avoid the inner aisles."