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The genetic tendency toward body size should make identical twins of roughly the same build, generally the same metabolism, and even subject to the same Allergies. However, as they grow, differences in environment can begin to make them less identical: they may eat at different times, prefer different foods, and have different interests (especially sports) that cause them to use calories at different rates. For fraternal twins, you may have both striking similarities and wide divergences.

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8y ago
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8y ago

Most likely, if your health is the same, you are taking in more calories. Or you are not metabolizing the same or your activity isn't the same. Just because you are identical twins doesn't mean you are exactly the same in everything you do.

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Q: Why do I weigh more than my identical twin sister?
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