Most people already know the basics of healthy eating. The problem is the gap between knowing and doing — planning meals, calculating portions, figuring out what to buy, and actually sticking to it week after week. That is exactly the kind of repetitive, logical work that AI handles well.
You do not need a specific app. Any AI chatbot — Claude, ChatGPT, Gemini — can work through this with you. What makes the difference is asking the right questions. Here are the exact prompts to use.
Step 1: Find your daily calorie target
Everything starts here. Before meal plans or shopping lists, you need one number: how many calories your body actually needs, given who you are and what you want to achieve.
Most people either guess or use a generic calculator that ignores important details. AI can factor in your age, weight, height, activity level, and specific goal — and explain the reasoning, not just spit out a number. Copy and adapt this:
I am a [age]-year-old [man/woman], [height] cm, [weight] kg.
My activity level is [sedentary / lightly active / moderately active].
My goal is to [lose X kg / maintain weight / build muscle] over [timeframe].
What should my daily calorie target be?
How should I split those calories between protein, carbs, and fat? Explain your reasoning.
The answer gives you the foundation for everything else. If the number seems surprising, ask the AI to walk you through the calculation step by step. This takes about two minutes and replaces what most people never bother to figure out at all.
Step 2: Build a meal plan around that number
Once you have your calorie target, turn it into actual meals. Be specific — the more detail you give, the more useful the result:
Build me a 5-day meal plan for [your calorie target] calories per day.
I do not eat [any restrictions, e.g. pork, gluten, dairy].
I have about [20 / 45] minutes to cook on weekdays.
Keep breakfast simple — something I can make in 5 minutes.
Include snacks. Show the approximate calories for each meal.
If something in the plan does not appeal to you, just say so in the same chat: "Replace the salmon with chicken" or "I hate chickpeas, swap them out." The AI remembers the whole plan and adjusts in seconds.
Step 3: Turn it into a shopping list
Now ask for the shopping list in the same conversation:
Give me the shopping list for this plan.
Group items by category: fruit and veg, meat and fish, dairy, dry goods, other.
Quantities for one person for 5 days.
This takes the AI about 30 seconds. Doing it manually from a meal plan typically takes 10 to 15 minutes — and you still forget something.
Step 4: Get a workout plan that fits your real life
Generic workout plans fail because they ignore your actual schedule, your equipment, and what you are realistically willing to do. Give the AI your constraints upfront:
Create a workout plan for me.
Goal: [lose fat / build strength / improve general fitness].
I can train [X] days per week. Each session: max [45] minutes.
Equipment: [gym / dumbbells at home / no equipment].
Level: [beginner / intermediate].
Include rest days and a short explanation of why each exercise is included.
Ask it to adjust as you go: "Make Monday shorter, I have an early meeting" or "Replace running with cycling." You are not locked into the first version — treat it like a conversation with a patient, knowledgeable friend.
Step 5: Keep yourself on track with scheduled check-ins
Knowing your plan is only half the job. The harder part is following it week after week. This is where Claude Cowork adds something most chatbots cannot do on their own: it can run on a schedule.
You can set up a weekly check-in — every Sunday evening, for example — where Claude asks how the week went, adjusts your plan based on what worked and what did not, and reminds you to update your shopping list. It works like a coach who never forgets to follow up, and who already knows your history.
To set it up, open Claude Cowork and ask:
Set up a weekly check-in every Sunday at 7pm.
Ask me how my diet and workouts went this week.
Based on my answers, suggest any adjustments to my meal plan or training.
This is not complicated. It is a reminder system with memory — one that can actually update your plan, not just ping you with a generic notification.
One important note
None of this replaces a doctor, a dietitian, or a personal trainer. For anything medical — a specific condition, a medication, a significant health concern — professional advice matters and AI is not a substitute. The American Heart Association notes that AI-generated meal plans can be well-balanced but may miss nuances that a professional would catch.
What AI changes is the planning layer: the part that is tedious, repetitive, and easy to skip. When your plan is already written out for you, following it becomes much easier.
Start with the calorie prompt today. Everything else follows from that one number.