Except _what_ you eat has a big factor in how much you eat. Some foods are more satiating than others. Some are more addicting than others.
So eating less may also require eating different.
So eating less may also require eating different.
Experiment: go to Wal-Mart and try to buy maple syrup (actual maple syrup; mostly what they call syrup at Wal-Mart is literally just water, corn syrup, and dye). Now try to buy canned pears without any added sweeteners (if you find one without sugar, it has Splenda). Now try to buy a loaf of bread without any added sugar (most loaves contain brown sugar). Almost everything in almost every conventional grocery chain in the U.S. is loaded with sugars, sweeteners, and other addictive substances. Even if you try really hard to buy healthy foods at a normal grocer, you are going to have a hard time.
Not everyone with a weight problem is shoving 50 Snickers down their gullet every day, and that characterization has to stop if we're going to realistically address the issue.
http://www.walmart.com/ip/Great-Value-Pure-Maple-Syrup-12.5-...
2. Pears in pear juice (no other sweeter). WalMart's own brand: http://www.walmart.com/ip/Great-Value-Fruit-Pear-Halves-Bart...
3. Organic sprouted whole wheat bread: http://www.walmart.com/ip/Alvarado-St.-Bakery-Sprouted-Whole... (All bread needs some "sugar" for the yeast to work on. Some that say "sugar free" get sugar from milk or fruit juice.)
"Healthy Life Sugar Free 100% Whole Wheat Bread" http://www.walmart.com/ip/Healthy-Life-Sugar-Free-100-Whole-...
Even if a healthy alternative is on the shelves at your local Walmart, and it sometimes is, virtually all of the shoppers are going to come back with an unhealthy option thinking it's healthy. The one or maybe two items that are actually healthy (and by "actually healthy", I just mean real food; something you can make from a plant or animal without a chemist's involvement) have to be picked out from dozens of nearly-identical SKUs that are deceptively labeled.
Try this on someone who doesn't know you're going to try it on them: check the ingredients and values on someone's healthy food item that they got at a mainstream grocer (Target is almost the same as Walmart, they just have a more prominent nut section) and see how much sweetener was added to it. My health-conscious buddies usually find out that their premium "super-healthy" green band 100% whole grain wheat bread has added sugar.
I actually have bought real maple syrup at Walmart. It was tucked in the very top corner of the shelf and there were only three units stocked. By contrast, there was a whole section of thickened, dyed sugar water syrup on the wall, probably 25 SKUs. Again, the issue is not that it's hypothetically impossible, the issue is that 99.9% of the patrons, even those who are intentionally trying to buy a healthy option, are not going to be able to do it successfully. There's a reason for that, and that reason is that the grocer, the distributor, the manufacturer, and all the rest of the way up the supply chain, they don't want you to be able to buy healthier, because access to more filling, low calorie options means not only that you'll be healthier, but that ultimately you'll buy a lot less food.