The RDA for vitamin A is 900 mcg per day for men and 700 mcg per day for women. You can easily reach this by eating foods that are common on a keto diet. Since fat will be your primary source of calories on the keto diet, you will be using fat as a lever to help you meet your body composition goals. In other words, to gain or lose weight, you will have to increase or decrease your fat intake. As you continue to restrict carbs, your body will produce so many ketones that it will enter ketosis.