Also, a list of the highest-fat foods:

Being vegan will definitely make most people lose weight.
as much as you're right in one way or another, these examples are literally only fat
assuming you're using
this list, an example of a high-fat food that isn't either oil, lard, or shortening doesn't show up until page three
the first thing that you could actually eat that shows up under high-fat foods is item #130, salt pork, which has been cured to use as a non-perishable concentrated source of energy during winter months. The next non-condiment non-oil on the list is item #139, dry pilinuts.
Also, unless you consult a dietician and/or know what you're doing, suddenly becoming vegan would be incredibly unhealthy, considering you're literally denying yourself about half of the food pyramid