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Nir Eyal argues that common fitness apps and wearables often fail and may even contribute to weight gain. He gives three reasons: (1) the simplistic ‘calories in, calories out’ framing ignores hormonal and metabolic differences between foods; (2) exercise can increase hunger and trigger moral licensing that leads to overeating; and (3) most fitness products are not enjoyable or habit-forming, so users quit and yo-yo diet — successful health tech should make activity inherently enjoyable and guide food choices, not just count calories.

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