It's not often you get something good for free, so I thought it worth adding this. I found a one hour video by Douglas Lisle, the other co-author of The Pleasure Trap, online. It's courtesy of the Vegetarian Society of Hawaii.
People really need to understand this, namely that we are today being asked to solve problems that our nervous systems were never designed for. The only solution is to understand the problem, intellectually, and even then it is not easy because the solution goes against everything that your instincts tell you.
I have several videos by Dr Lisle, and I can tell you that the content in this one is as good as in the paid ones.
After the bit about the grey shrike, he explains the pleasure trap, and how he thinks a supervised fast at True North can reset the nervous system. I won't quote any times from the video, because really speaking one has to watch the whole thing, perhaps several times even, for its content to really sink in. Even then some people will fail a few times, but at least they will be able to understand why.