Hi Christine, replying to yesterday’s condo here. Hope you don’t mind
Another example is in this image. You could consume 1750 cals on 2 different days based on the type of meals you have. The same thing happens with the chicken and salmon (or the other) flavours of Dr. Elsey’s kibble ( same amount of total cals but from different amounts of macronutrients )
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Dr. Pierson’s website (catinfo.org) has a
section on calculating the %calories from proteins/fats/carbs and it comes with a warning -
This may give you a headache.
Haha, no, we have to look at both

We want to see how many calories are contributed by the carbs.
When we say LC food, it means that out of the total energy (ME) that the cat gets out of the food, 0-10 % of the energy (i.e. calories) is contributed by carbs (and the rest by proteins and fats).
Pet food mostly consists of two major parts—water and dry matter While water is important, the nutrients (energy, protein, minerals, and vitamins) are found in the dry matter part of the food, so it is important to know what % of the food is associated with dry matter.
From catinfo.org: You will see conflicting carb values listed for the same food depending on how the value is calculated.
There are 3 basic methods used to calculate the value of an individual nutrient:
- As a % of food weight (includes water) (As Fed) - shows how much fat/protein/carb is in a scoop of that food as it comes out of the bag or can. (Dr. Elsey’s chicken 2.53% carbs as per chart)
- As a % of dry matter - shows how much fat/protein/carb is in the food after all the water is removed (Dr. Elsey’s chicken 2.77% carbs as per chart)
- As a % of calories - shows how much of the total energy in the food comes from fat/protein/carb (Dr. Elsey’s chicken (2.4% carbs as per manual calculation)
Calculating the
%s of calories from carbs from DMB and as-fed values gives you the same numbers. BUT if you take the DMB or as-fed numbers as %s without converting it and determining the calories from each, then you don't have a realistic number.
Once you get the DMB or the as-fed numbers, you have to plug them into a calculator (or convert manually) to get the %calories from carbs.
Hope I haven’t made your head hurt more