My bmi is 41.esr=24 s(<15).crp=5mg/dl (<0, 5). my dietologist say that the alterations are due to my obesity.is it true? thanks

Probably: The sed rate is normal for you in my book; CRP is neither sensitive nor specific. When i'd strongly suggest is that you undertake a fitness-focused lifestyle, have the cause of your abnormal bleeding thoroughly worked up, and not try to treat labs that are neither sensitive nor specific. As a pathologist / lab specialist, my motto is, 'treat the person, not the number.'.

Very much so: We know that obesity actually promotes inflammation and cause elevations in ESR and CRP(nonspecific markers of inflammation). It doesn't mean this has to be the case, as many things can lead to elevated ESRs/CRPs, but it could very well explain your laboratory findings.