Consider the source of the statement and you will find such a god is a manufactured concept based on unenlightened understanding of God and the universe. If a person gets exercise and has a healthy diet, the mind will work more clearly and the energies will flow more freely through the brain, mind and body. Poor diet can also cause a person to have a foggy mind and be less present. One of the objectives of yoga practices is to maximize health in order to prolong healthy life in order to accomplish as much as possible spiritually. The choice to eat or avoid certain foods is an individual matter.
Many people have subtle allergies to some foods, and each metabolism is different.
I have been a pure vegetarian at certain periods of my life, but I now eat chicken and fish, but not red meat. This is mostly a personal issue of what I have found works best for my body, and not a recommendation for others. There are those on committed spiritual paths who are strict vegetarians and others who eat all varieties of meat. Historically the tolerance level for advanced spiritual practices has been higher in the East. This is an individual matter.