One of my teachers, Omer Hilajee, his wife would cook her food doing prayer on the Prophet the entire time. With Nyah (Intention) for Shifa (healing); That God would make that food a healing for the people that ate it and make the energy that they derive from it, used for worshiping Allah.
They would only buy from grocers in Medina that they knew prayed five times in the prayer in the Masjid.
They would go out and pick their own animals and sacrifice them, because they didn't want to buy meat from these butchers that they didn't know how they were treating the animals.
This is a real family that I have visited over the years. It is a fact and I guarantee many people have experienced this. If you go and have eaten a full meal, and you go there, and they serve you food in the house of Omer Milahjee, you will not get indigestion by eating a second meal immediately after at his house. Many people have testified to this because they will force you to eat.
They will say "Kul! (eat) Kul! (eat) Kul! (eat)
That food was made with presence.