I'm guessing you mean the low-carb vs. low-fat conflict?
You don't have to take my word for it, and in fact I wouldn't want you to, but...well... low-fat is bunk
Plenty of people lose weight by cutting carbs. Particularly people who are prone to glucose regulation issues (i.e. diabetes) and insulin resistance. Dietary fat is *good* for you, believe it or not! Just not in the presence of 200-300+ grams of carb per day which is what most people are told to eat to be "healthy."
Check this out: http://www.diabetes-support.org.uk/info/?p=225
and this for good measure: http://www.diabetes-support.org.uk/info/?p=231
I swear I'm not a conspiracy theorist!
Scientific research, being a human activity, is nowhere near as objective as we are often led to think it is. Among other things, it has trends (research subjects that are popular or unpopular at different points in time). Right now and for the past 30 or so years the "research darling" has been heart disease and obesity (the research started long before that, but it's really been in vogue since the 80s or so). We've got to where, in diabetes care, the medical community would prefer to treat us for the heart disease we *might* get rather than the disease we *actually* have (pet peeve of mine hehe). And the kicker is that it's the fact of NOT controlling, i.e. not treating, that actual disease that increases our risk for heart problems in the first place!
Glucose in the blood causes inflammation to the artery walls, inflammation leads to plaque (which is supposed to cover the wound and help it heal). But because of all the excess glucose the body has had to process, the cholesterol that it has on hand to make the plaque with has been a rush job, so it's poor quality and "sticky", so the plaques get bigger than they should. Which means, heart disease. So the very best thing you can do for your health, if you ask me, is to lower your BGs. Period.
But I realize it can be quite the mind-warp when you've been thinking the other way round for your whole life! It feels instinctively wrong, I mean we feel like, looking or thinking about fat, that it's inherently unhealthy, but the truth is that fat is just fat and how we feel about it and envision it is actually a cultural idea that we've absorbed. And whatever is learned can be unlearned!
(Sorry, this is the quick-and-dirty version of the reply, let me know if I didn't express something well!)