1560s, to remove (a nut, etc.) from a shell, from shell (n.). The meaning to bombard with shells is first attested 1856. To shell out disburse (1801) is a figurative use from the image of extracting nuts. Related: Shelled; shelling.
There are 14 calories in 1 cup, slices (3 oz) of Nopales (Cactus Leaf), raw. You'd need to walk 4 minutes to burn 14 calories. Visit CalorieKing to see calorie count and nutrient data for all portion sizes.
Some meals at Taco Bell aren't low in fat. The Fiesta Taco Salad is 770 calories and has 75 carbohydrates. The Nachos BellGrande has the same amount of calories and 3 more carbs. The Crunch Wrap Supreme is 540 calories and 71 carbs, and the Fresco version is 460 calories and 67 carbs.