In this LAB note
Question · Hypothesis · Method · Results · What Failed · What We Learned · What Changed at MOMS
Question
Within one calorie-density label and one fixed serving size, how large is the real range in calories — and which macronutrient actually drives it?
Hypothesis
Fat carries roughly twice the calories per gram of carbohydrate or protein (9 kcal/g vs. 4 kcal/g), so we expected fat grams to be the strongest predictor of calorie variance among recipes that share MOMS's "Filling" calorie-density label. A shake running high in calories within that label, we assumed, would be the one running high in fat.
Method
MOMS's 201-recipe formulation database assigns every shake a Cal Label — Light, Standard, Filling, or Meal Replacement — describing roughly how calorie-dense it is. All recipes are served in the same fixed 16-ounce cup regardless of label, so within one label, calories can only vary through ingredient composition, not portion size. We isolated the 65 recipes labeled "Filling" and calculated Pearson correlations between total calories and each of fat, carbohydrate, and protein grams. We then compared the two recipes furthest apart in calories — Airy Cleanse (EY-W2-DETOX-006-V1, 270.5 kcal) and Amber Detox (WY-W1-DETOX-017-V1, 399.9 kcal) — alongside a third, Vivid Nourish (WAI-W3-NUTR-004-V1, 399.8 kcal), which reaches the same calorie ceiling by a different route. For context on whether beverages behave like solid foods here, we checked Crowe et al.'s (2004) analysis of 247 beverage items in the Australian food supply, which found a consistent fat-to-energy-density relationship for solid foods but no clear relationship between energy density and macronutrient content for beverages specifically.
Results
Across the 65 "Filling" recipes, calories correlated more closely with carbohydrate grams (r = 0.36) than with fat (r = 0.19) or protein (r = 0.15) — the opposite of our hypothesis. The calorie range within this single label ran from 270.5 to 399.9 kcal, a 129-calorie, 48% spread, all inside the same 16-ounce serving. Airy Cleanse and Amber Detox make the point concretely. Their fat (7.0g vs. 7.8g) and protein (30.6g vs. 31.6g) are nearly identical. Their carbohydrate is not: 19.9g vs. 52.8g, a 33-gram difference traceable to banana, pineapple, and white rice in Amber Detox against a single 50g carrot in Airy Cleanse. That carbohydrate gap alone accounts for most of the 129-calorie difference between them. Vivid Nourish shows the other path to the same ceiling. It hits 399.8 kcal not through carbohydrate (30.5g, close to Airy Cleanse) but through fat — 16.5g, more than double Airy Cleanse's, from coconut milk, cashew, and chicken instead of egg white and almond milk.
What Failed
The carbohydrate correlation is real but weak: r = 0.36 means carb grams explain only about 13% of the calorie variance across all 65 "Filling" recipes. Twenty of them — including Vivid Nourish — reach the high end of the calorie range mainly through fat, not carbohydrate, which is the opposite of the pattern Airy Cleanse and Amber Detox suggest. Neither macro is a reliable single predictor of where a "Filling" shake will land in calories. That matches Crowe et al.'s (2004) finding that beverages, unlike solid foods, show no clean relationship between energy density and macronutrient composition — so the scatter in our own data likely isn't a quirk of these 65 recipes, it may be closer to how beverages behave generally. We can't claim carbohydrate is "the" driver; at most it's the more common of two divergent paths.
What We Learned
"Filling" is a calorie-density label, not a nutrient profile. Two shakes can share the label, the exact serving size, and nearly the same calorie count, while getting there through fat-forward or carbohydrate-forward routes that are nutritionally almost opposite. That distinction may matter beyond the label itself: in a controlled study of matched liquid carbohydrate loads, DiMeglio and Mattes (2000) found people's bodies compensated poorly for liquid carbohydrate calories (−17% dietary compensation) compared to an energy-matched solid carbohydrate (118% compensation) — meaning a carbohydrate-forward liquid calorie load, like the one in Amber Detox, may be handled differently by the body than the same number of calories carried as fat. A customer choosing by calorie-density label alone has no way to know which route they're getting, or that the two routes may not be nutritionally interchangeable.
What Changed at MOMS
We now tag each "Filling" recipe internally with its dominant calorie driver — carbohydrate-forward or fat-forward — alongside the existing Cal Label. It doesn't change which recipes exist, but it means a customer who wants to limit one macro and not the other can filter within a calorie-density tier instead of assuming every "Filling" shake behaves the same way.
References
Crowe TC, La Fontaine HA, Gibbons CJ, Cameron-Smith D, Swinburn BA. Energy density of foods and beverages in the Australian food supply: influence of macronutrients and comparison to dietary intake. European Journal of Clinical Nutrition. 2004;58(11):1485-1491. | DiMeglio DP, Mattes RD. Liquid versus solid carbohydrate: effects on food intake and body weight. International Journal of Obesity. 2000;24(6):794-800.
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