"The stomach is closely related to the brain; and when the stomach is diseased, the nerve power is called from the brain to the aid of the weakened digestive organs. When these demands are too frequent, the brain becomes congested. When the brain is constantly taxed, and there is lack of physical exercise, even plain food should be eaten sparingly. At mealtime cast off care and anxious thought; do not feel hurried, but eat slowly and with cheerfulness, with your heart filled with gratitude to God for all His blessings. MH 306.1"
"For as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee."
Both passages connect thoughts/heart with eating habits. Proverbs 23:7 speaks to the insincerity of a person's hospitality if their heart isn't genuine, while EGW discusses the importance of a positive mental state during meals for proper digestion. There is a thematic parallel between the mind/heart and the act of eating.
"Many who discard flesh meats and other gross and injurious articles think that because their food is simple and wholesome they may indulge appetite without restraint, and they eat to excess, sometimes to gluttony. This is an error. The digestive organs should not be burdened with a quantity or quality of food which it will tax the system to appropriate. MH 306.2"
"All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any."
1 Corinthians 6:12 speaks to the idea that even if something is permissible, it may not be beneficial. EGW's passage applies this principle to eating, arguing that even wholesome foods can be harmful if consumed in excess. It's about self-control and not being mastered by appetite.
"Be not among winebibbers; among riotous eaters of flesh:"
Both passages address the dangers of overeating and gluttony, although the EGW passage focuses more broadly on dietary habits while the proverb specifically mentions 'riotous eaters of flesh'.
"Custom has decreed that the food shall be placed upon the table in courses. Not knowing what is coming next, one may eat a sufficiency of food which perhaps is not the best suited to him. When the last course is brought on, he often ventures to overstep the bounds, and take the tempting dessert, which, however, proves anything but good for him. If all the food intended for a meal is placed on the table at the beginning, one has opportunity to make the best choice. MH 306.3"
"Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God."
The EGW passage provides a specific example of how to apply the principle of doing all things to the glory of God, in this case, by making wise choices about food consumption and avoiding overeating. It's an application of the broader principle.