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I think that shows the massive calorie overestimates that people can make.
3 medium eggs at 70 calories each, dash of milk/oil/butter brings it up to 300 calories.
100g of dry brown rice is 350 calories, 100g of cooked brown rice is 120 ish.
2 tins of tuna can vary from 200-400 calories based on whether they are packed in brine, water or sunflower oil.
600 calorie extra a day would completely write off a calorie surplus.
You could be right
Just don't ask chatgpt!