FYI I’ve been tracking food and estimating calories and carbs for several years, and it’s kept me at 155-165 pounds at 6’. I don’t use a specialized tracking app, I simply maintain a separate food journal in Day One, with one journal per day housing time-stamped entries whenever I eat. (Before that I used monthly text files.) When I sit down to eat I’ll enter what I ate (and try to estimate amounts if at a restaurant), then later I’ll google/duckduckgo the dish plus the words calories carbs and the first few hits will invariably provide sites that give that info. If there are multiple recipes or a couple of sites with varying results I’ll split the difference or use the data from the high-cal version. (And it’s also simple to search in Day One to pull up cal/carb counts from previous meals, if I’m eating the same dish.)
Towards the end of the day I’ll total up the calories and carbs.
I don’t find it to be particularly time-consuming, although I wish Day One had the facility to time-stamp and append to a selected file so that I could tap a shortcut button and be able to start typing right below a timestamped entry that from that day’s journal page. When on my Mac I’ll use a PopClip extension that pastes timestamps.
Haven’t ever missed an entry, couldn’t tell you why. No secret, I just did it.