The metabolism thing has been proven to be bogus so dont worry about that, if you prefer 2 times a day then do that.
For sodium unless you have high BP that is caused by some sort of salt sensitivity then you probably dont need to cut it out. You need to lose real weight, not just water weight that you might be holding onto because of your sodium. I dont look at it at all.
I personally do not consider anything off limits so the occasional chips or tortillas wont kill you. The problem with them is that an ounce of chips will run you anywhere from 130 to 160 calories or more. Its not a lot of food and its not filling at all. Not that easy to justify their inclusion just based on the numbers alone. I imagine tortillas will give you a similar issue. Hard to just eat a serving so probably not worth it.
Number one most important thing is hitting your calorie number that gives you the deficit you are looking for. Fat has a lot of calories so you wont be able to eat a lot of fatty foods, but other than that its not something you need to avoid altogether. I try to stick to high protein from lean meats, lots of veggies with moderate carbs and moderate fat.
__________________
|