"Bread should be light and sweet. Not the least taint of sourness should be tolerated. The loaves should be small and so thoroughly baked that, so far as possible, the yeast germs shall be destroyed. When hot or new, raised bread of any kind is difficult of digestion. It should never appear on the table. This rule does not, however, apply to unleavened bread. Fresh rolls made of wheaten meal without yeast or leaven, and baked in a well-heated oven, are both wholesome and palatable. MH 301.2"
"No meat offering, which ye shall bring unto the Lord, shall be made with leaven: for ye shall burn no leaven, nor any honey, in any offering of the Lord made by fire."
Both passages discuss the avoidance of leaven in certain food preparations. Leviticus prohibits leaven in offerings to God, while EGW advises against it in everyday bread for health reasons. The underlying principle of avoiding leaven connects them.
"Grains used for porridge or “mush” should have several hours’ cooking. But soft or liquid foods are less wholesome than dry foods, which require thorough mastication. Zwieback, or twice-baked bread, is one of the most easily digested and most palatable of foods. Let ordinary raised bread be cut in slices and dried in a warm oven till the last trace of moisture disappears. Then let it be browned slightly all the way through. In a dry place this bread can be kept much longer than ordinary bread, and, if reheated before using, it will be as fresh as when new. MH 301.3"
"In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return."
The emphasis on thorough mastication connects to the idea of labor and effort in obtaining nourishment, echoing the concept of earning bread by the sweat of one's brow.
"Far too much sugar is ordinarily used in food. Cakes, sweet puddings, pastries, jellies, jams, are active causes of indigestion. Especially harmful are the custards and puddings in which milk, eggs, and sugar are the chief ingredients. The free use of milk and sugar taken together should be avoided. MH 301.4"
"Hast thou found honey? eat so much as is sufficient for thee, lest thou be filled therewith, and vomit it."
This verse warns against excess, which aligns with the passage's caution against too much sugar in food.