Can you be just short of targets?

Are you talking calories or nutrition? Either way, it's somewhat flexible.

Calories: If you told MFP you want to lose a pound a week, it gave you a daily calorie goal 500 below its estimate of your current weight-maintenance calorie needs. A kilogram loss per week, 1100 calories per day. You can do the arithmetic and figure out partial pounds/kilos worth of calories, and get an estimate of those current weight-maintenance calories; or you can set MFP to "maintain weight" and see what it says as a goal estimate, then reset back to your target loss rate.

Either way, you can get an estimate of current weight maintenance calories. Any time you eat below that weight-maintenance calorie number, MFP expects you'll lose fat weight. Obviously, the closer you eat to maintenance calories, the slower the expected loss. Only over the maintenance calories would you expect to gain or regain weight.

It's also not necessary to hit the target (or very close) every single day: It's fine to look at the average calories over a few days to a week. MFP resets at midnight, but our bodies don't.

Nutrition is a little different. It's never necessary to be exactly exact every single day, even if nutrition is important to you. (Nutrients don't directly affect weight loss rate, though they can have an indirect effect on loss rate if sub-ideal nutrition triggers fatigue or appetite struggles.)

For nutrients, generally, "pretty close on average over a few days" is fine. A little over one day, a little under another day, no big deal. If persistently very low on protein or fats much of the time, that might be worth improving for best health, but still no need to be exact. (Protein and fats contain "essential nutrients", things we need to eat for best health because our bodies can't manufacture them out of any other intake.)

Malnutrition isn't instant, either, so you can work at any desired improvements over a period of time, as long as eating in an overall generally reasonable way and not diagnosed with deficiencies or relevant health conditions from the get-go.

The MFP phone/tablet app will let you look at weekly averages for calories and nutrients, if you choose to monitor it that way.

Both calorie level and nutrients are important, IMO, but stressing over hitting them exactly isn't helpful. I think in terms of that "pretty good on average over a few days" idea.

Best wishes!

….or let the app do the math for you by using the drop down box under “nutrition”:

Single day view

Weekly average view