Please choose the correct ending to complete the given sentence: Health: [header] How to pack a healthy lunch (for adults ) [title] Find out which foods are healthy. [step] For example, whole wheat bread is better than white bread because processing white bread requires removing the natural nutrients contained in wheat. Whole wheat products are also better for your digestion.

Ending1: You should have about 3.5 cups of whole grain flour, and for example, a tablespoon of wheat bran for every ounce of flour. [substeps] Corn flakes or whole wheat-amaranth flour, such as this adds carbs, vitamins, minerals, and was once considered healthy. Ending2: Natural fiber is the best source of fiber in healthy foods. Avoid pure white bread because it contains too much added sugar. Ending3: [substeps] The definition of nutritious food is: food that is a significant source of fiber, vitamins, and (preferably) organic substances. Organic and whole foods are more nutritious than processed foods. Ending4: If you're feeling particularly gassy, try on a wide variety of breads. However, be careful not to stick to too many wheat.

Answer format: ending1/ending2/ending3/ending4