Psoriasis: can it really be fixed by diet?

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I often read online that psoriasis can be fixed via changing diet.
I asked my dermatologist and he said false.
I see other MD online also saying false.
Not sure what to believe, I dont see a grift angle for people who say diet fixed them as they arent selling books or anything else.
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I have psoriasis and psoriatic arthritis
managing it via biologic subcutaneous injections such as Humria/Enbrel/Taltz
Kinda scared of potential long term effects, hoping to find some high IQ insight