The difference between a meal plan and a grocery list
A grocery list tells you what to buy. A meal plan tells you what to eat and when — which is the decision that actually burns people out. Making three food decisions a day adds up to 21 decisions a week, and decision fatigue is real. When those decisions are made in advance, you eat better, waste less, and spend less on impulse purchases. This prompt handles the planning part so you only need to handle the cooking.
The 'avoid repeating the same meal twice' instruction
Without this, AI meal plans often give you chicken and rice four days in a row because it's easy and fits many dietary goals. The no-repeat instruction forces variety, which is both more enjoyable and more nutritionally rounded. If you have a meal you genuinely want repeated — a family favourite or a batch-cook staple — add 'except for [meal], which we eat twice' and the AI will work around it.