"I think the first mistake is they start with unhealthy ingredients," he says. "They are not looking at the natural aspect of food. Number two, in looking at the cooking techniques, I've noticed we're tough on our food. We beat it up. We want it hot, we want it now, we want it deep fried, we want it blackened, we want it burnt. If you look at the European style of cooking, it's much more genteel: poaching, steaming, taking your time. We've got to realize that, because what happens when we're doing this to our food, we destroy essential vitamins."
回答
1、挑剔;苛刻;讲究
2、be tough on: 严格对待

4、be tough on: 认真对待任何事情.

这句话中的tough应该怎样翻译比较好?: http://insuns.com/article/19519-1.html