Is it normal i have never managed to go two days without eating?

Because a lot of people on the internet recommend fasting and claim it will have all sorts of health benefits and "everyone" should do it (with a few obvious exceptions like if they are pregnant). And many even claim to voluntarily not have eaten for weeks to lose weight. So I have tried fasting and at most gone 24-25 hours without eating. But I always tend to feel really hungry during the last few hours of that day (which I guess is obvious) and feel I at least would have to eat something before going to bed, going hungry is the ultimate way to ruin your sleep. In addition I tend to get really unfocused and lethargic when I do that, so I could not do that on a work day. How many have actually tried going a day or more without eating? And how difficult do you find it? Should you still do it if you're lean (but not underweight)? Should you do it even if you're physically active? Are those people right?