"Reasons for Discarding Flesh Foods Those who eat flesh are but eating grains and vegetables at second hand; for the animal receives from these things the nutrition that produces growth. The life that was in the grains and vegetables passes into the eater. We receive it by eating the flesh of the animal. How much better to get it direct, by eating the food that God provided for our use! MH 313"
"And God said, Behold, I have given you every herb bearing seed, which is upon the face of all the earth, and every tree, in the which is the fruit of a tree yielding seed; to you it shall be for meat."
EGW directly references and expands upon the principle established in Genesis 1:29 regarding God's original provision of plant-based food for humans.
"Flesh was never the best food; but its use is now doubly objectionable, since disease in animals is so rapidly increasing. Those who use flesh foods little know what they are eating. Often if they could see the animals when living and know the quality of the meat they eat, they would turn from it with loathing. People are continually eating flesh that is filled with tuberculous and cancerous germs. Tuberculosis, cancer, and other fatal diseases are thus communicated. MH 313.2"
"For I am the Lord your God: ye shall therefore sanctify yourselves, and ye shall be holy; for I am holy: neither shall ye defile yourselves with any manner of creeping thing that creepeth upon the earth."
While Leviticus 11:44 speaks generally about avoiding defilement and maintaining holiness, EGW's statement about diseased meat causing illness can be seen as a specific application of this principle, suggesting that consuming such meat defiles the body. However, the connection is not explicit.