Is Rejection for Titration Due to Low BMI regular practice?

I was diagnosed with ADHD through RTC with HealthHarmonieMinds and had my titration appointment, but was almost immediately rejected even the possibility of titration for both stimulant and non-stimulant because my BMI is very low.

I would simply like to ask if this is normal practice? I'm aware that loss of appetite is a monitored side-effect. The consultant referenced the NICE guidelines as the reason why he supposedly "had no choice", but nowhere do the guidelines say someone with low BMI is ineligible for medication. Rather they simply talk about monitoring BMI DURING titration. It's also my ADHD that CAUSES me to have no appetite and struggle with eating. Surely medication would help me when eating is already a struggle? I would prefer having no appetite but the ability to conjure enough energy to eat as opposed to my state now, which is no appetite and no energy. I explained that my appetite was already non-existent throughout my assessments and within this titration appointment but the consultant here just responded "It's the guidelines".

I've tried to search for reddit posts where people were flat-out rejected titration. All I've been able to find are instances where people were put off medication through being observed during titration. I have not even been considered for titration at all.

Furthermore, I was confused at the fact BMI was considered the be-all, end-all when its widely known to be an unreliable indicator on its own for individual health needs and outcomes. The consultant took no consideration of anything to do with my personal circumstances. He simply looked at BMI within the first 30 seconds and said no.