I told a fat that Apple juice isn't really healthy. Denial ensues. Short story. She was going on about how she doesn't believe in giving her kids coke or other sodas, and they drink lots of Apple juice. I said something along the lines of how it's not my business, but Apple juice is around as unhealthy as coke. Yeah, it has some trace vitamins/minerals, but hardly anything. I tried explaining to her that soda is mainly unhealthy because of the excessive sugar in it, which leads to excessive calories. Soda isn't necessarily bad because it's processed, after all peanut butter is processed and fairly healthy in small quantities, so  is Greek yoghurt, Oatmeal, etc. She was adamant that because Apple juice is "natural" it's healthier.  So I googled the nutrition facts, right in front of her, and said "Actually, the coke has slightly fewer calories per ounce. They really are quite similar in terms of nutrition, they both have about the same amount of sugar. A lot of the nutrition in an apple, like the fiber, is lost when you juice it. While an apple is healthy, the juice really isn't." She immediately flipped out on me, saying how corn syrup will kill children or something (Even though the sugar makeup of corn syrup and fruit sugars is quite similar). I gave up and said "Yeah OK, you're probably better off giving your kids something without a ton of sugar in it like water and having them eat their fruits". Or something like that, but she was in denial. I ended up just leaving the conversation to talk to other people at the party, shouldn't have tried reasoning with a fat.