I'm aware that drastically shifting fiber intake tends to disagree with the body (when I ate cereal, I had to mix Froot Loops with Cheerios to avoid the stomachache from Cheerios). Thus, I want to know how I can slowly transition from getting virtually no fiber in my diet to having something like what my childhood used to be.

I pretty much only eat junk food, because other foods I try to get into only last about week or two before I'm bored of them. I also have an issue with money and food - I've been raised not to "waste food", yet my mother is constantly "be healthy! Eat fruit and veggies!"... but when I eat a fruit or veggie I don't like, she gets mad about wasting money. Even with my own money, I'm very cautious on what I get, because I don't want to... you guessed it, "waste money". Thus, my only safe space is with junk food (corndogs, fast food, etc.).

I've considered consulting with a nutritionist when this pandemic is over, but until then, I'll have to do this on my own; so I've decided to start by tackling my bowel movement problem (I tend to eat greasy/cheesy foods that cause my stomach problems), and my main questions are:

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• How much fiber should I start out with, for how long, and at what intervals should I increase intake?
• What are some specific foods that could get me started without causing my stomach too much trouble? I know this will mostly be up to my discretion, as I'm sensory-sensitive(?) and certain foods are intolerable for either that reason, or they cause my stomach problems (celery and string beans, for example)
• What supplement would you suggest for someone starting out? I suppose the same few questions in the first bullet would apply here, as well.

This is going to take time from me, of course, as I'm not used to including other foods in my diet unless I'm having a craving, and with the whole "wasting money" mindset I have to unlearn. All feedback is greatly appreciated!