The fifth attempt is a different problem
The first time, you were ignorant and hopeful. This time you are informed and tired, which is harder.
You are not short of information. You could write the plan yourself and probably have, twice.
What is missing is a reason to believe that this version of you finishes something. That is not a nutrition question.
The scale is the wrong witness
A scale reports water, salt and the hour you stood on it. It cannot see the walk you took on a day you did not want to.
So it tells you that you failed on days you did everything right, and you believe it, because it has a number on it.
Weigh yourself if you like. Just stop letting it be the only thing that gets to say how you are doing.
What to count instead
- The number of days this week you ate something you actually planned to eat.
- The number of evenings you got through the hour that usually undoes you.
- Whether you started again the same day after a bad meal, instead of on Monday.
Those three are within your control today. The weight follows them, slowly and out of order.
The regain is the part nobody plans for
Most people plan the losing and improvise the keeping. Then month five arrives, nothing is dramatic, and attention drifts.
Decide now what you do in the week you gain three pounds back. Written down, in advance, while you are calm.
Not a punishment. One sentence about what you return to, so a bad week never gets to be a verdict.
Why writing to yourself helps
People who feel continuous with their future self make more patient choices about health and money (Hal Hershfield, future-self continuity research, 2011).
The version of you 40 pounds down is not a fantasy. They are the same person, further along, and they remember this week clearly.
So describe them in ordinary detail. What they eat on a Tuesday, and what they no longer negotiate with at 9pm.