This is a hard question to answer because it changes over time. Of course you want to give them nutritional diet and at first nothing much changes. Then you may find that their tastes change. Things they used to like may not appeal to them anymore. Sometimes texture is a big deal. As things progress, there may be more changes like needing softer food or having things like steak cut into small pieces so it’s easier to chew. Finger foods might be easier to eat. They may love sweets. That seems to be common. Nothing wrong as long as the sweets are limited. As they get into the later stages you have to move to softer foods. Them may have problems swallowing capsules or large tablets and you will need to be mindful that they don’t choke on their food. Toward the end they will need puréed foods and eventually they will stop eating. Basically your goal is to have nutritional meals considering any diseases they may have diabetic diet, low sodium etc. however, we are working with a terminal disease. By the time they are in a moderate stage, prevention tactics, really aren’t going to help. Pick your battles. You need to keep them comfortable and happy. Watch their weight so they are maintaining, make sure they have plenty of fluids. And if you have a specific eating problem, check in With your Alz team, and they will have a bunch of suggestions.
It seams coconut related foods and spread is very good for people with Alz. Just keep an eye on the cholesterol. It actually has a reputation of improving mental abilities. Some research on this was done and I saw a couple of videos also. My own experience as caregiver can confirm this. Also in addition to chicken, red meat, fish, and prawn made a difference. We also rubbed the neck where it connect with the skull, with a oil called miracle magnesium which gave incredible results.
During the last year of my husband's life I gave him whatever he wanted to eat. I tried to limit his sugar intake with smaller portions but never, ever refused him. He loved bananas and would eat 2 or 3 a day. His comfort was the most important thing to me.
When my mom had Alzheimers I would try to have some of her favorite snacks around including fruit, not just sweets. What I learned was that she did not want to eat alone so, I would take the time to sit with her and eat. This was true of her regular meals, too.
Timothy never ate sweets or snacks but now loves them. I try to keep fruit that he likes - although this changes from week to week. Mostly sliced peaches, frozen strawberries, bananas, oranges and an occasional apple. He likes Nature Valley peanut granola bars but I have to watch that he doesn't grab a handful. Candy doesn't seem to be an issue, but he likes chips and recently has liked hummus and crackers. Peanut butter and jelly, ice cream in any form and Sprite are a given