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Guide · 3 min read

Copy. Paste.
Review your intake.

By Eric Parker, founder of TrueCal.

Copy. Paste. Adjust the food words. These are the patterns that get accurate logs back instead of "let me think about that for a minute."

These examples explain how to ask an AI assistant for nutrition estimates. To save meals in TrueCal, use the TrueCal app. Its connected custom ChatGPT integration can log meals and review progress, subject to account access. It is not yet published in the ChatGPT plugin directory.

Restaurants — name the chain.

Chains have published nutrition. Use them.

chipotle bowl: brown rice, double chicken, black beans, fajita veg, mild salsa, no cheese, no sour creamcopy
sweetgreen harvest bowl, regular size, with extra chickencopy
starbucks grande oat milk latte, 2 pumps vanillacopy

Homemade — describe portion + cooking method.

The two things that move the calorie count most: portion size and added fat.

scrambled eggs, 3 large, cooked in a tablespoon of butter, one slice toastcopy
pasta with tomato sauce, about 1.5 cups, parmesan on topcopy
grilled chicken breast, palm-sized, with roasted veg and a tablespoon of olive oilcopy

Packaged — name the brand.

TrueCal pulls the label.

two RXBARs (chocolate sea salt)copy
one Chobani Greek yogurt, vanilla, 5.3ozcopy

Mystery meals — say what you can.

TrueCal flags estimates. Don't agonize.

someone's home cooking, looked like beef stew with potatoes, about 2 cupscopy
a few bites of someone's slice of birthday cake, maybe a third of a slicecopy

Drinks — they count.

two glasses of red wine, regular pourcopy
tall coffee with cream and one sugarcopy

Say it like this.

Pattern: [food] + [portion or size] + [brand or chain, if any] + [modifications]. That's it. TrueCal handles the rest.
Guide depth

More guide details

Examples, related workflows, and practical next steps.

Guide

ChatGPT calorie tracker prompts (copy-paste)

Copy-paste prompts for logging restaurant meals, homemade food, snacks, and drinks in a ChatGPT calorie tracker. Includes portion phrases that improve accuracy.

Short answer

The best ChatGPT calorie tracker prompts are structured: meal, portions, details, then an output format (calories, macros, assumptions, questions). Use the same template every time so your logs are comparable, and add details for the foods that create the biggest errors (oils, sauces, drinks, restaurant items).

  • One template beats 10 clever prompts
  • Ask for assumptions so you can correct them
  • Give portions and “calorie multipliers” (oil, sauce, cheese, alcohol)

The core template (use this 80% of the time)

Estimate calories and macros (protein, carbs, fat).

Meal: [what I ate]
Portions: [rough amounts]
Details: [brand/recipe/cooking method, sauces, oils, drinks]

Output:
1) Total calories + macros
2) Assumptions you made
3) 1-2 questions to improve accuracy

New to the idea? Start at ChatGPT calorie tracker.

Restaurant prompt

Estimate calories and macros.

Restaurant meal: [item(s)]
Portions: [full/half/size]
Modifications: [no mayo, extra cheese, etc.]
Extras: [chips, guac, sauce, dessert, drink]

Output: calories + macros + assumptions + what you need to know to be more accurate

Homemade meal prompt

Estimate calories and macros.

Homemade meal: [what it is]
Portions: [rough amounts]
Recipe details: [main ingredients]
Cooking fats: [oil/butter amount if known]
Toppings/sauces: [cheese, dressing, etc.]

Output: calories + macros + assumptions + questions

Packaged food prompt (brand matters)

Estimate calories and macros.

Food: [brand + exact item]
Serving size: [what I ate]
If you’re unsure: ask me 1 question that would improve accuracy most.

“I have no idea” prompt (still better than skipping)

Estimate calories and macros using reasonable assumptions.

Meal: [what I ate]
Context: [restaurant/home], [how hungry], [small/medium/large]

Output:
1) A conservative estimate range (low/typical/high)
2) Biggest uncertainty
3) The one detail I should provide next time

Portion phrases cheat sheet

  • Rice/pasta/oats: “1 cup”, “2 cups”, “1/2 cup”
  • Protein: “palm-sized”, “about 6 oz”, “2 eggs”
  • Fats: “1 tbsp olive oil”, “2 tbsp ranch”, “a handful of nuts”
  • Snacks: “1 bar”, “1 bag (single-serve)”, “half the bag”

How to get better results

  • Keep a short “defaults” list (milk type, oil use, bread type) so you can reference it quickly.
  • When you’re unsure, ask for assumptions and correct them.
  • Use the same structure every day to reduce mental overhead.

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