Whats the point of even eating at all?

Recently diagnosed after having symptoms since 12yo (currently 22yo) and it just seems to keep getting worse.

I have lost almost 40lbs in the last 3 months without trying and at first i was happy but now im getting nervous. I am starving and exhausted 24/7. My chosen family are so kind and trying to educate themselves about what i can and cannot eat, but i dont know how to even tell them i dont care about eating anymore. I struggle to find a reason to eat besides that my body needs it to function, which it can barely do anyway.

I had dinner with them yesterday and my partner made us fried rice and baked chicken. She made mine separate with margarine and cut the pieces of chicken up smaller. Its so kind and sweet of her and even still it makes me feel alienated. I keep coming back to the same question: "whats the point of eating anyway?". Making food is her love language and i truly love her cooking, but whats the point?