Weight gain during pregnancy is not scientific and is steeped in fatphobia, nor are the "recommended weight gain guidelines" rooted in any evidence. You are growing a human, check out page 16 in your pregnancy resource for more info on how your body changes.
Your weight changes in pregnancy! It HAS to, because your body is changing & growing.
This change in weight is made up of many factors - and only one of those factors is actually related to the amount of adipose (fat) tissue your body is growing. Creating stores of adipose tissue around your hips, belly, thighs, & buttocks is your body's way of storing nutrients for later in pregnancy & while feeding postpartum.
Most of the change in weight is due to your blood & fluid supplies increasing by up to 50% of their usual, plus a baby complete with amniotic fluid, placenta, and a growing uterus. So even if the amount of adipose tissue in a pregnant body doesn’t change in pregnancy - in most pregnancies - weight still needs to increase to accommodate all these things.
The number of kgs/lbs that each of these things consists of is vastly different from person to person - even the vague estimates don’t accommodate for ethnicity, height, body type, gender affirmative surgery/hormones, or other variables.
This is why minimal or no weight gain recommendations for larger pregnant bodies aren’t really evidence based or practical - in order to achieve this it still forces you to be in a calorie deficit & lose adipose tissue in order to keep your weight neutral amongst your increasing blood, fluid, and baby size.
Eat when you’re hungry, stop when you’re full, hold yourself lovingly, and toss the scales out the window.
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