There is no argument that fiber is beneficial for a diabetic. The problem is that many foods that are high in fiber are also high in carbohydrates. Prime examples are whole grains and legumes. Which are great for high-carb low-fat vegans. However, low-carb high-fat diabetics need to get fiber from low-carb sources, such as chia seeds, flaxseed, psyllium husks, and non-starchy fibrous vegetables.

A High-Fiber Diet Helps You Lose Weight and May Fight Cancer

Grains, beans, nuts, and seeds

More Evidence That a High-Fiber Diet Can Curb Type 2 Diabetes

The Problem with Grains and Legumes