What are the best carbohydrate sources for someone on a low-carb diet?

For a low-carb diet, the best carbohydrate sources are non-starchy vegetables like leafy greens, broccoli, and cauliflower, as well as low-carb fruits like berries. Nuts and seeds can also provide fiber and nutrients. Avoid high-carb foods like grains, sugary fruits, and starchy vegetables to stay within your carb limit. Focus on nutrient-dense options to ensure a balanced intake.