I can attest from a personal anecdote that eating plant-based makes it enormously easier to cut calories. Provided you don’t decide to take the costliest, least healthy route of basically living off heavily processed plant-based substitutes or the cheapest, second-least healthy route of living off pasta, ramen, and cereal, you’re likely on a diet with plenty of healthy mono- and polyunsaturated fats (and pretty minimal saturated), a high amount of proteins from nuts, seeds, grains, and legumes, a moderate amount of carbs in the form of cereal and simple sugars from fruits, and an absolute abundance of fiber (of which 95% Americans don’t get enough).
Even just incorporating something like tofu into your diet helps a bunch, because it’s basically all protein and good fats while having just a small amount of carbs. Per calorie, it does the best job I’ve ever seen of making you feel full for a long time.