If 100g mushroom has 3.3g carbs, 3.1g protein and 0.3g fats where’s the rest of the 100g? As it what makes it up?
How do macros not equate to the total weight of a food, not exclusively for mushrooms but more generally
In: Chemistry
Most of the remaining weight is water. Mushrooms are over 90% water by weight and even that is very dry compared to a lot of other fruits and vegetables. If you fry mushrooms you evaporate the water making them shrink and become very light. And even then they are still mostly water.
A glass of water exists despite not having any weight in “macros”. Not everything is listed.
Most foods have a lot of water in them, that’s going to be the bulk of the weight difference
Water and trace elements that don’t appear on the label.
Look at[ this label](https://water-research.info/wp-content/uploads/2015/12/Tabla-Agua.jpg) of a bottle of water. It apparently contains nothing, despite a serving being 240ml, which obviously weighs 240g.
Look at [this label](https://m.media-amazon.com/images/I/71FcBiCAjeL._AC_SL1500_.jpg) of some low-sodium salt. 100g contains only 33g of salt. That’s because *salt* on a label is specifically *sodium chloride*. This product is made of a mix of sodium chloride and potassium chloride. Potassium chloride isn’t “salt”, so it doesn’t appear on the nutritional information. Furthermore, you can see that 33g of salt only contains 13.3g of sodium. That’s because the rest of the weight is chloride, and chloride doesn’t have to be recorded at all.
Food labels only record the specific things that they are required to report.
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