The bloating is caused by the production of gas by the bacteria in your gut. If you add a lot of fiber at once, the bacteria will overpopulate, and produce too much gas, causing bloating/distension. One way to avoid this is to gradually increase the amount of fiber, so your microbiome will adjust slowly, allowing you to avoid the excess gas/bloating. Not sure what to say about the constipation, though it could be a similar issue.
These things are not simple, are they?
One strategy is to focus on the healthy veggies that your genetic ancestors likely ate; your body is more likely to be adapted to those foods.
I didn't ask for your advice and I'm not a moron so I know how to use google just as well as you do.
This is the shit I'm talking about. If you have difficult losing and maintaining weight people crawl out of the woodwork to parrot bullshit advice they got from some clickbait article as though knowledge isn't the easiest part of the process. People don't have difficulty with their weight because they lack knowledge, people have difficulty with their weight because suffering sucks and the human body doesn't like having to eat itself.
These things are not simple, are they?
One strategy is to focus on the healthy veggies that your genetic ancestors likely ate; your body is more likely to be adapted to those foods.