Yeah, that will happen. Its fruits and vegetables so its healthy, good and can cause no problems at all according to pop-dietetary science, especially among the kind of people ignorant enough to take veganism seriously.
But the hard science is that these are all carbs, a lot of them with a high glycemic index, so it puts your blood sugar and insulin levels on a rollercoaster, in turn affecting your sense of appetite too, nothing good will come out of that diet.
The other part of hard science is that food is energy in chemical form, and fat is energy reserve..
The basics are simple: input minus output equals reserve. To reduce the reserve you need to make it go negative, regularly, for probably a long time.
You can do that by increasing the output (physical activity), decreasing input (reducing calorie intake), or some combination of both, as long as the end result goes negative.
Feeling hungry or not is a more complicated matter dependent on the diet and your personal biological tendencies, characteristics and general state of your organism that is more or less related to that, depending on how well functioning your organism is; and if its not, these things can go completely crazy. It is perfectly possible to feel hungry even when eating more than enough gain weight (how do you think the morbidly obese people got that way?), or don't feel hungry and lose weight - obviously the easier and generally preferable way of losing weight, which makes it my personal favorite.
And the way i have pulled that off is:
1. Get used to 2 meals a day. If you're not that physically active, which from context i guess you're not, you don't need 3. Never felt much like eating after waking up anyway, so usually i don't eat breakfasts since about a decade. That one isn't even for losing weight, merely for not gaining it for no reason at all.
2. Continuing with that, never eat when you're not hungry. And i mean hungry. Not when you think you may be hungry, not when you are bored, not because its dinner time, not because its convenient, eat when you are hungry, and you are absolutely sure of it. Rare exceptions matter little, habit and majority of the days matter most.
3.What i did end up eating to lose weight was some variation of keto\carnivore diet. Probably kept it to about 70-80% calorie intake in meats, eggs and dairy, so according to some material on those not very strict, 90-95% would be desired, but in the end it worked out to losing almost 1kg per week, which is good enough for me.
4. It takes at minimum a week to get used to it and see the proper effects. While normally i'd get hungry about 6-8 hours after a meal, with that diet it would extend to 10, 12, and over second week sometimes up to 14-16 hours. Minding rule 2, i would sometimes go down to 1.5 meals a day effectively, and not big ones at that. On top of that when i do get hungry on that diet, its less sudden than when on more normal, balanced diet, instead it is a very slow, gradual rise of that feeling, so may aswell ignore it for few hours and plan to eat sometime around then.
5. Especially for the first week, you may be annoyingly distracted by the feeling of hunger as you adjust, to deal with this figure out some ways to suppress it that will work for you. Water, caffeine, some types of low calorie snacks, whatever works.
