You do the other way around, you see the total weight of the thing, you guesstimate how much you are gonna eat and you do the math. Half of 500g is 250, so x2.5 whatever is on the 100g nutritional panel.
It’s not about when you would use the per 100g it’s about 100g being easy to be transformed into other units so you get an easy multiplier you can apply to the values.
I always used the 100g as percentage since the rest of the nutrients is also listed as g. So if there is 9g of protein per 100g, then i can just make an easy approximation for whatever the serving is.
If you are American it’s about 4oz, and if you want a visual with most foods that is roughly a cubic inch of food per ounce. It’s not exact but it’s close enough to understand when applied to stuff like oil and butter alongside cotton candy or dry crackers where the densities and amounts used dramatically differ.
Serving size has a lot of use cases, especially when looking at things individually packaged or in separate units (cookies for example).
Per 100g has fewer use cases in my mind as I’m not a scale and have no idea how to break down most products into 100g.
You do the other way around, you see the total weight of the thing, you guesstimate how much you are gonna eat and you do the math. Half of 500g is 250, so x2.5 whatever is on the 100g nutritional panel.
It’s not about when you would use the per 100g it’s about 100g being easy to be transformed into other units so you get an easy multiplier you can apply to the values.
I always used the 100g as percentage since the rest of the nutrients is also listed as g. So if there is 9g of protein per 100g, then i can just make an easy approximation for whatever the serving is.
If you are American it’s about 4oz, and if you want a visual with most foods that is roughly a cubic inch of food per ounce. It’s not exact but it’s close enough to understand when applied to stuff like oil and butter alongside cotton candy or dry crackers where the densities and amounts used dramatically differ.
So to hit my macros tonight I can treat myself to 7 cubic inches of pie. Got it.