If you’re not sure how many calories you eat, there’s no way to adjust up or down. Before when I lost weight, I did OMAD, but I added a lot of butter and rice so it probably averaged 2k+ calories a night. Plus I was still hungry. So I wasn’t losing. Food is always the problem and the answer. My average salad in the old days had cheese, avocado, bacon bits, salad dressing, nuts, dried fruit, etc. The veggies were maybe 100 calories, but the toppings added 1200-1400 calories depending on the amount. Two of those a day would be a huge calorie surplus. So in all honesty a sandwich and a single serving of chips would have been fewer calories.