You keep going on about steak... It doesn't look like you've eaten anything in months.
Also, if you kill the cow, you lose the milk.
Cow = Milk
Milk = Cheese
Cheese = Goodness
Thus, Cow = Goodness
Poor elves, no wonder you have so many problems.
You are doing it wrong.
To reduce metabolism, include nuts and seeds in the diet. Of all the foods you can eat, nuts and seeds, which contain almost no moisture and provide healthful unsaturated fats, have the highest caloric density, packing in the most calories per ounce. Polyunsaturated fats, such as those in nuts, have been shown to be oxidized more slowly than monounsaturated fats. Nuts and seeds are also rich in the amino acid arginine. Arginine is used by the body to make nitric oxide, a gas that has been shown to reduce the metabolic rate.
Pecans, not cows.