Simply experience what it's like. Make sure to consume lots of vegetables and fruit, not only dognuts :-) Prepare at least one delicious meal based only on plant-based foods.
Here are some ideas
Breakfast: cooked porridge (from oats or millet...) sweetened with raisins and dates and a sqashed banana. Have it with oat milk or soy milk or make a smoothie with fruit juice and the banana instead of cooking it in the porridge.
Lunch: Big fresh salad and steamed or baked potatoes with a vinaigrette of finely chopped olives, capers, onion, rosemary.
Light dinner: Grated carrot and cabbage salad topped with baked tofu (spice how you like it) and toasted pumpkin seeds.
Yum!
Sleep well knowing you did it :-)