You are correct. The passage you're thinking of is in the book *The Ministry of Healing*. Here is the full paragraph: "Some are continually anxious lest their food, however simple and healthful, may hurt them. To these let me say, Do not think that your food will injure you; do not think about it at all. Eat according to your best judgment; and when you have asked the Lord to bless the food for the strengthening of your body, believe that He hears your prayer, and be at rest." (MH 321.2) A very similar statement is also found in *Christian Temperance and Bible Hygiene*: "Some health reformers are continually worrying for fear their food, however simple and healthful, will hurt them. To these let me say, Do not think that your food is going to hurt you; but when you have eaten according to your best judgment, and have asked the Lord to bless the food, believe that he has heard your prayer, and be at rest." (CTBH 59.1) She also warned about the direct physical effect of fear itself, stating, "If you are in constant fear that your food will hurt you, it most assuredly will." (2T 530.2)