You are what you eat. Aren't you?

Did it ever occur to you how we seem to go around in circles about what is and isn't good for you? I mean food. A decade ago, I could have sworn it was all the fat that is bad. By the time I trained myself to not eat fat - there came the "good" fat and the "bad" fat. While I wrestled with that new information, I'm now told it's the carbs that are bad. Whatever happened to the fat I was monitoring? And it looks like the "bad" fat is only "somewhat bad" and the "good" fat is actually better than "good" and we need both to fight the "real" evil - the carbs. Like in a cheap Hindi movie, the "real" villain is somebody else altogether that has to be fought only by uniting 2 erstwhile enemies (who, if you're lucky, turn out to be brothers, but I digress!). Now just as I'm getting the hang of it, informed sources report that there are again the "good" carbs and the "bad" carbs. By now this must sound familiar. Just like the mindless fashion industry which, to be honest, doesn't appear to have had a new idea since cloth was invented, the health and food industry (is that a valid industry?) seems to rely solely on going round in circles and enlisting suckers at every turn. All this because none of us can get the simple message "eat everything, eat less" when it comes to food!