Vegetables and fruit are how you eat a satisfying amount of food without a lot of calories, and how you get the fibre and micronutrients that supplements imitate badly. Different colours carry different compounds, which is why 'eat the rainbow' survives as advice — it's a shortcut for variety.
A workable target is a fist of vegetables at lunch and dinner and one or two pieces of fruit a day. Frozen counts. Pre-chopped counts. Canned, rinsed, counts. The version you'll actually eat is the right version.
If big raw salads leave you bloated or too full to get your protein in — common on a GLP-1 — cook them instead. Roasted, sautéed, or blended into a soup takes up less room and digests more easily.
Fruit is not sugar you need to fear. It arrives with fibre and water, and it's usually the easiest swap for whatever you were eating out of a wrapper.