The last-supper effect: why every diet starts Monday

The pre-diet blowout isn't a character flaw — it's a predictable response to incoming scarcity. Break the start-date cycle and the 'last supper' disappears on its own.

You know the ritual. The diet starts Monday, so Sunday becomes a farewell tour — the pizza, the ice cream, the everything, because tomorrow it's all forbidden. Researchers actually call this the 'last supper effect,' and it shows up reliably every time restriction is on the calendar.

Scarcity makes hoarders of us all

It's the same psychology as panic-buying before a storm. When your brain believes food is about to be scarce, it drives you to stock up — and then the diet 'fails,' and the failure gets blamed on you instead of on the setup.

Here's the reframe that changes everything: there is no Monday. Nothing is about to become forbidden. When no food is scheduled for exile, there's nothing to say goodbye to — and the blowout quietly stops happening.

The diet cycle needs a start date to survive. Refuse to give it one.

About the author

Maya Reyes, M.S., RDN

M.S., RDN, LD · Anti-diet dietitian

Maya is a registered dietitian nutritionist in East Austin helping people quit the diet cycle for good. She writes the way she practices: science-backed, weight-inclusive, and allergic to food shame.