what substitues? you mean vegetables?
so eating fruits and vegies is demanding? more that eating meat?
Yes, it's a lifestyle, you have to be very conscious about it. It's also so that the amount of veggies and fruit you have to eat to get to the equivalent of a piece of meat, is pretty high. For example, 100g of spinach and 100g of red meat both contain more or less 3,5g of iron. But 100g spinach is a lot more on your plate than a 100g steak. I don't even think you can fit 100g of spinach on a plate (when it's not cooked). That's why my sister was often snacking on chickpeas, because she had to get her protein and iron for the day. I think if you can do it and be healthy, good for you, but I don't think it's easy, it requires an effort.
JG, please, if you don't eat a portion of half a kilo, there is no issue. 100-150g, as is advised.
I like variety in my diet, I love veggies but all beans and no meat would make me a very sad girl. Still, it's personal, I guess.
BTW, I love peppers. Stuffed with lamb mince.