Every few weeks a guy tells me he's stuck choosing between two diets. Keto or Mediterranean. Carnivore or macros. He's been researching for a month and hasn't started either one.
I get to tell him the choice was settled in 2005.
Researchers took 160 people and randomized them across four famous diets: Atkins, Zone, Weight Watchers, and Ornish. One full year (Dansinger, JAMA). Atkins and Ornish are exact opposites. One cuts carbs, the other cuts fat.
It ended in a tie. All four worked about the same.
How well people stuck to whichever diet they got predicted weight loss in every group. The diet name predicted almost nothing. And the two strictest diets bled the most people, with 47 to 50% quitting inside the year.
A bigger analysis later pooled 48 trials and 7,286 people. After a full year, the gap between low-carb and low-fat came out to 0.02 kilograms (Johnston, JAMA). About four nickels.
Which plan will you still be running in March? That's the only question the data cared about.
Which is why I build plans backwards from the worst week on the calendar. Your last plan assumed home every night, an empty gym, nobody's birthday. Then the real week showed up with a delayed flight and a client dinner, three rules broke at once, and the plan got abandoned instead of adjusted.
Flip it. Take whatever you're doing now and subtract rules until what's left survives your ugliest week of the month. That stripped-down version is the actual plan. Everything above it is bonus on the good weeks, and skipping it on a bad week breaks nothing.
Tonight, think back to the last diet you quit and name the rule that broke first. That rule ended the whole thing. Don't rebuild around a better rule. Rebuild without it.
In your corner,
Coach Zack
P.S. Reply with the rule that broke your last plan. I read every one, and I'll help you build the version that survives without it.