Iron Culture presented by MASS Ep 370 - Calories: Labels vs Reality
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Mar 25, 2026 They unpack a class-action over misreported protein bar calories and why lab tests can misclassify fat replacers. They explore how fiber, resistant starch, and whole-food matrices change actual energy absorption. They cover thermic effect, processed foods raising intake, and why consistent, low-variability food choices often beat obsessing over label precision.
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Labels Are Estimates Not Absolute Truth
- Food labels are estimates with measurement, reporting, and regulatory assumptions that can misrepresent actual macronutrient content.
- The David bar case shows novel additives (EPC/lestra) and flawed assays (gravimetric/bomb calorimetry) can inflate measured calories or fat versus metabolizable energy.
Same Calories On Paper Can Yield Different Absorption
- Food choice can change metabolizable energy even when two diets look isocaloric on paper.
- High protein, high fiber, whole-food diets can reduce absorbed calories via TEF, resistant starch, and fiber effects versus processed diets.
Food Matrix Can Reduce Fat Absorption
- Food matrices (e.g., milk fat globule, nut skins) can block absorption of their own fats, altering health and energy outcomes.
- Full-fat dairy and whole nuts can reduce fat absorption via MFGM or structural barriers.