Real Agent Cases

Cut a family's grocery spend from $400–$500 every few days to $140 a week with a ChatGPT meal plan

Posted
by Brooke Ferrier (ABC News)
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Beginner-friendlyNo logins, payments or coding needed. Low risk: paste the prompt and you should get something useful.

Outcome

When Brooke Ferrier, a parent of two on the NSW Central Coast, and their partner both lost their jobs, Ferrier asked ChatGPT for a low-cost meal plan for two adults and two toddlers, then refined it with follow-ups: hidden vegetables, low-carb options and no lentils. ChatGPT gave one recipe per meal with variations for each person, compared supermarket prices and produced a categorised shopping list with quantities. A week of breakfasts, dinners and snacks came to $140, against the $400–$500 Ferrier had been spending every four or five days, with much less food thrown out. Ferrier also uses it to find recipes for long-forgotten pantry items.

Agent

ChatGPT

Prompt Recreated prompt

The source didn't share its exact prompt, so we wrote this from what it describes.

Before you start, ask me 1–3 short questions about anything important that's missing below. Keep them quick. Then do the task, checking in with me at the key points.

Goal: Make a low-cost weekly meal plan for my household and a shopping list with exact quantities.

What I can give you (ask for whatever's missing):
- Who's eating (ages, how many): [DETAILS]
- Weekly budget and where I shop: [DETAILS]
- Likes, dislikes and must-avoids: [DETAILS]
- What's already in my pantry, fridge and freezer: [LIST]

Rules:
- Use one base recipe per meal, with simple variations for different people.
- Use up what I already have first, and plan leftovers into later meals or snacks.
- Group the shopping list by supermarket section, with quantities and an estimated total.
- Keep the meals balanced, with vegetables and fibre in most of them.
- Check facts that can change (prices, opening hours, dates, availability, rules) against the official source, and tell me anything you couldn't verify.

Output: A 7-day plan (breakfast, dinner, snacks), the recipes and a categorised shopping list.

You'll know it worked when: the week's shopping comes in under budget with little waste.

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Optional stronger version

Our rewrite with extra checks. The poster didn't test it.

Before you start, ask me 1–3 short questions about anything important that's missing below. Keep them quick. Then do the task, checking in with me at the key points.

Goal: Make a low-cost weekly meal plan for my household and a shopping list with exact quantities.

What I can give you (ask for whatever's missing):
- Who's eating (ages, how many): [DETAILS]
- Weekly budget and where I shop: [DETAILS]
- Likes, dislikes and must-avoids: [DETAILS]
- What's already in my pantry, fridge and freezer: [LIST]

Rules:
- Use one base recipe per meal, with simple variations for different people.
- Use up what I already have first, and plan leftovers into later meals or snacks.
- Group the shopping list by supermarket section, with quantities and an estimated total.
- Keep the meals balanced, with vegetables and fibre in most of them.
- Check facts that can change (prices, opening hours, dates, availability, rules) against the official source, and tell me anything you couldn't verify.

Output: A 7-day plan (breakfast, dinner, snacks), the recipes and a categorised shopping list.

You'll know it worked when: the week's shopping comes in under budget with little waste.

Before you finish: re-read my goal and constraints, check your answer against each one, and list anything you assumed or couldn't confirm.

Source

https://www.abc.net.au/news/2025-05-30/using-artificial-intelligence-to-plan-meals-save-grocery-money/105302996

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