In this LAB note
Question · Hypothesis · Method · Results · What Failed · What We Learned · What Changed at MOMS
Question
Avocado shakes carry 5.8 more grams of fat than banana shakes. If fat is 9 calories per gram, why do they list only 6.7 more calories?
Hypothesis
We expected avocado shakes to run noticeably higher in calories. Fat carries 9 kcal per gram on the standard Atwater scale and carbohydrate carries 4, so a fat-rich Body ingredient should push the total up. We also expected the avocado shakes to need a smaller dose by weight, since avocado is far more energy-dense than banana. We did not expect the Score to care. Our internal Score is built from label numbers and ingredient variety, not from which fruit sits in the Body slot.
Method
Published research: Wien, Haddad, Oda and Sabaté (Nutrition Journal, 2013) ran a randomized 3x3 crossover trial in 26 overweight adults. Adding about half a Hass avocado to a lunch (a mean of 67.5 g, range 50 to 90 g) was followed by 23% higher satisfaction and a 28% lower desire to eat over five hours, compared with an avocado-free control. That avocado added about 112 kcal, and the authors note the energy may account for some of the effect. The doses also matter here: the smallest dose in that trial was larger than the average avocado dose in our shakes, so we use the paper only to show that avocado is a fat-rich food worth looking at, not to claim a satiety effect for our recipes. Internal analysis: we read all 201 recipes in the MOMS database and kept shakes whose Body slot holds exactly one ingredient, either avocado (25 recipes) or banana (20 recipes). We compared average Body grams, calories, protein, carbohydrate, fat, fiber and Score, then matched pairs inside one body type, week and goal where calories and protein were within a few units.
Results
The two groups use very different doses and land at nearly the same calories. The 25 avocado shakes average 28 g of avocado, 384.6 kcal, 32.6 g protein, 34.0 g carbohydrate, 14.1 g fat and 9.1 g fiber. The 20 banana shakes average 49 g of banana, 377.9 kcal, 32.0 g protein, 45.8 g carbohydrate, 8.3 g fat and 8.3 g fiber. Avocado shakes therefore carry 5.8 g more fat and 11.8 g less carbohydrate, with 6.7 more calories. The arithmetic closes: 5.8 g of fat is about 52 kcal, 11.8 g of carbohydrate is about 47 kcal, and the 0.6 g of extra protein adds about 2 kcal. Two matched pairs show it at recipe level. EI-W1-CLEANSE-015-V1 (Mellow Rinse, Avocado 26.3 g) lists 396.1 kcal, 28.3 g carbohydrate and 18.2 g fat. EI-W1-CLEANSE-009-V1 (Soft Clarity, Banana 60 g) lists 398.7 kcal, 47.1 g carbohydrate and 9.9 g fat. Same body type, same week, same goal, calories 2.6 apart, and both score 16. Avocado used 34 g less Body ingredient by weight. The average Score is 14.8 for avocado shakes and 14.2 for banana shakes, a gap of 0.6.
What Failed
The fat gap is not all avocado. In WY-W1-DETOX-013-V1 (Clarity Flow) the avocado dose is only 11.7 g, yet the shake carries 17.7 g of fat against 10.3 g in its banana match, WY-W1-DETOX-018-V1 (Inner Filter, Banana 21.4 g). A 7.4 g fat gap cannot come from 11.7 g of a fruit that is mostly water. It comes from the rest of the recipe: Clarity Flow pairs the avocado with egg and tofu, while Inner Filter uses cashew and chickpeas. So the avocado-banana comparison is confounded by what else the recipe does. Body type is a second confound. Avocado appears in seven body types and banana in six, and the two sets are not the same. Fiber also failed to follow the average: in both matched pairs the avocado shake has less fiber (8.3 g against 9.4 g, and 7.9 g against 9.4 g), even though the group averages favor avocado by 0.8 g. Finally, the carbohydrate swap is not guaranteed. Five of the 25 avocado shakes carry more carbohydrate than the banana average of 45.8 g, for example EY-W1-ENERGY-012-V1 at 52.3 g, where dates, kale and oat milk supply the carbohydrate. And no avocado shake in the set falls below the banana-group fat average, so we cannot say what an avocado shake with banana-level fat would look like. The 0.6 Score gap is small, and we do not claim the Body fruit causes it.
What We Learned
In our recipes the Body slot is a macronutrient swap rather than a calorie decision. Avocado and banana arrive at almost the same energy by different routes: one brings fat, the other brings carbohydrate, and the weight in grams of the Body ingredient predicts neither calories nor satiety. Calories alone hide the difference between the two shakes; fat and carbohydrate show it.
What Changed at MOMS
We now describe Body slot choices by the fat and carbohydrate they trade rather than by their calories or their dose. When a draft recipe needs a lower-carbohydrate Body, we check the fat total across the whole recipe before approving an avocado swap, because the other slots can add as much fat as the avocado does.
References
Wien M, Haddad E, Oda K, Sabaté J. A randomized 3x3 crossover study to evaluate the effect of Hass avocado intake on post-ingestive satiety, glucose and insulin levels, and subsequent energy intake in overweight adults. Nutrition Journal. 2013;12:155.
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