We understand your concern for your mother's health and nutrition. Let us first address the spiritual aspect of your request, as this is the most important. It is mentioned nowhere in this request that you are praying in the name of Jesus Christ. It is only by His name that we have access to God.
Acts 4:12 WEB "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved!"
Without the name of Jesus, there is no power over the physical or spiritual. If you have never called upon His name and believed in your heart that God raised Him from the dead, do so today.
Romans 10:9 WEB "that if you will confess with your mouth that Jesus is Lord, and believe in your heart that God raised him from the dead, you will be saved."
Romans 10:13 WEB "For, 'Whoever will call on the name of the Lord will be saved.'"
Concerning her eating situation, we can see that you are requesting prayer for your mother's eating situation. In addition to spiritual health, God is also concerned about our physical health. Our bodies are the temple of the Holy Spirit, and we are to honor God with our bodies. This is not a popular subject in many churches, but it is clearly stated in His word. We are to eat and drink to the Glory of God. This means we are to pay attention to what we eat and drink.
1 Corinthians 6:19-20 WEB Or don’t you know that your body is a temple of the Holy Spirit who is in you, whom you have from God? You are not your own, for you were bought with a price. Therefore glorify God in your body and in your spirit, which are God’s.
1 Corinthians 10:31 WEB Whether therefore you eat, or drink, or whatever you do, do all to the glory of God.
We can pray for your mother not to desire unhealthy food, but to desire healthy food to keep her body strong for service to the Lord. God created food for us to eat and enjoy, but like all His gifts, we are to use His gifts to His glory. To eat properly is a spiritual decision, not just a physical one. So let us pray together for your mother to have the power to eat healthy and reject unhealthy food.
Heavenly Father, we come to you in the name of Jesus Christ, asking for your divine intervention in our beloved mother's eating habits. We pray that you will give her strength and wisdom to make healthy food choices. Help her to desire foods that will nourish and strengthen her body, and to resist those that are harmful. Please help her to understand to eat the correct amount of food.
We pray for your healing touch on her mind and body. Help her to overcome Alzheimer's/dementia and diabetes. Help her to understand what to eat and when to eat. We pray for a miracle in her life, that she would be made whole, in the name of Jesus Christ.
We also pray for those who are preparing her meals, that they would be guided by Your wisdom to provide her nourishing meals with normal amounts of fruits, low in damaging fats, and plenty of green vegetables. Lord, please help her to eat white fish at least two times a week. We ask for organized and structured eating habits for her, that she may be strengthened and renewed.
We also pray for her caregivers to have wisdom and knowledge to help her at this time. We also pray for you, that you will have the wisdom and discernment to help your mother at this time.
In all these things Lord, we pray that you would be glorified, and that she would be drawn closer to you. In Jesus' name, we pray. Amen.
Lastly, remember that God cares about every detail of our lives, including our diet. Trust in Him, and He will guide you and your mother through this journey.
Psalm 55:22 WEB Cast your burden on Yahweh, and he will sustain you. He will never allow the righteous to be moved.
Therefore, cast this burden on the Lord, trusting Him to help you both.
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
