I see a number of people on this thread attempting to conflate the vegan fad diet with the low-fat fad diet, even though there's no philosophical or physical link conjoining these two diets. One of my favorite afternoon snacks is a jigger of olive oil, followed by an ounce of nuts, usually walnuts. While dietary authorities recommend limiting dietary saturated fat to less than 7%, there is such recommendation for total dietary fat. In fact,
The results of prospective epidemiologic studies have in general suggested relations between specific types of fat and risk of coronary heart disease (CHD), but no relation with total fat.
If you look around at dietary recommendations for endurance athletes (which hopefully is the set of people reading this), while there are many studies and recommendations for a high fat diet, there are no recommendations for endurance athletes to eat less than 10% fat. Most recommendations run from 20%-30% fat, which is easily attained with a vegan diet. Just wanting to make that clear.
Here is a good article discussing dietary fat for the endurance athlete:
Fats in the Endurance World | Ultrarunning Magazine
Note for the vegan:
Seeds and nuts are rich sources of EFAs. No one seed or nut gives an optimum ratio of omega-3 to omega-6. Flax is the richest source of omega-3, but a poor source of omega-6. Sunflower and sesame seeds contain omega-6 but no omega-3. A variety of seeds and nuts in your diet aid in obtaining both.