I hate being the one to tell you. Congrats on the 48hr fast. You’ve started something most people will never be able to do….but you didnt lose 5LB of fat from a 48hr fast. You lost 1-1.5LB and 3.5-4LB of water/poop weight which naturally comes back once you eat again and your glycogens stores rebuild and gut fills back up with poop. New fasters need to learn not to get excited my the massive scale drops in the first couple of days fasting but equally not get depressed when most of it comes straight back on. Its part of the process. That 1-1.5LB of fat lost stays gone unless you eat a calorie surplus. The rule of thumb with fasting is you divide your TDEE by 3500 (number of calories in a pound of fat) to get your expected fat loss per fasted day. In my case thats 2400kcals/3500=0.7LB per fasted day. Anything above that calculation is either water/poop weight or explained by exercising and burning more calories than your normal TDEE (Total Daily Energy Expenditure = Basal/Resting Metabolic Rate + Average Daily Energy burn from activity) An online TDEE calc can work out your TDEE for you if you are honest with the data you put in)