You do not always have to choose just one, as they can be taken together, but one might be a higher priority for you right now
Delayed sleep onset is linked to decreased melatonin clearance, delayed melatonin peaks, increased melatonin levels during daytime and altered circadian variation of core body temperature
However, with proper protein intake (1.6-2.2g/kg/day) and resistance training 2-4 times weekly, you can preserve 90%+ of your muscle mass during weight loss
One advanced option available is Ozempic (semaglutide), a medication shown to support significant weight loss
C-reactive protein: risk marker or mediator in atherothrombosis
pubmed.ncbi.nlm.nih.gov, Onseng, Kittipong, et al