Choosing the right foods can help slow the accumulation of Aβ in the brain. According to the “Nutrition Reviews” (link below), you should try to eat “whole grains, fresh fruits, vegetables, legumes, fish, and low-fat dairy products” and avoid “refined sugars, French fries, high-fat dairy products, butter, and processed meat.”

“Natural phenols” can can be helpful in avoiding amyloid build up and are found in green tea, red berries, spices, and extra virgin olive oil (especially when oleocanthal is present). Such aromatic herbs as coriander, tarragon, fennel, laurel, rosemary, sage, mint, thyme, dill, dasil, chervil, chives, oregano, and parsley may also be helpful. Also recommended are fermented black tea, cinnamon, and ginger. Unfortunately, little is known about the doses of olive oil, spices, or aromatic herbs that are needed.

Finally, prebiotics and probiotics may be beneficial since the microbiome can influence Aβ deposition in the brain–especially when there is chronic inflammation.

https://academic.oup.com/nutritionreviews/article/74/10/624/2349955?login=false