I am not saying that you are having or will have the possible problem I’m about to describe, or even that it’s likely for you. But only that it can happen and it can be a good idea to keep track of it.
Some can gain surprising amounts of fat without looking much fatter, particularly if looking at only one point as a reference.
I’ve done quite a few dumb things over time, but have tried to learn from them. One of the dumbest, 20 years ago when just starting to lift, was to follow the ideas of a certain lifting guru who insisted that if dietary fat was low, and carb intake was from things like brown rice, then it was impossible to get fat and his advice for fast muscle gain was to eat 10,000 calories a day!
I followed his recipes, doing things like blending brown rice and tuna and drinking these mixtures many times per day. I wound up “limiting” myself to 6000 calories a day because I was putting on weight very fast and really 6000 calories seemed plenty, to say the least.
Soon I went from a somewhat fat 160 (weight if at say 10% bf would probably have been about 147 or maybe even a bit less) to 190. I did not think I was fat. Success!
Well, then I realized that I was fat. I didn’t do a body comp, but I continued training with more moderate diet and slow fat loss and ended stronger and at 158 lb and 6% bodyfat as measured by underwater weighing (not accurate in my case) and 8% by skinfold.
So in other words I was at least 30 lb too fat when at the 190 lb point. This diet was not the way to go. I had to lose a lot of time that could have been devoted to better muscle gain, had I not needed to diet the lard off.
Okay, my actions were particularly stupid and I was following a diet plan much worse than what you will. However the point of the story is, it’s a big waste of time to put on a lot of fat and then have to lose it, and it’s possible to not realize just how much fat is being put on until the problem has gotten, uh, very big.
The solution to this is to buy an inexpensive skin fold caliper and measure several convenient points. They don’t have to be “standard” points, but instead can be points that you personally can measure easily and precisely (if measuring several times in the same day, you get about the same result each time). For example, you might pick a particular spot, which you can go to the same spot everytime, somewhere near the navel; another spot on the thigh, and another spot on the chest.
Keep track of the sum of the measurements. If you let them double, then you are getting twice as fat, roughly speaking! If the total is clearly creeping up only very slowly, then you’re doing just fine.
Even where someone is at no risk of getting too fat, this can be useful because on seeing these values not increase, or increase obviously only very slowly and unimportantly, can give the confidence to eat more.