
You have low iron levels
Iron-deficiency anemia could be the culprit. Red blood cells need iron to carry oxygen in the blood, and low iron levels can impair circulation, says registered dietitian nutritionist Alyssa Tucci of New York, NY.
“Coldness in the extremities (hands and feet) is more pronounced because the body is smart, so it first diverts blood to vital organs like the heart and brain,” she says.
You need more vitamin B12
Vitamin B12 anemia can cause coldness, numbness, and lack of energy, she says. Like iron, most foods rich in vitamin B12 are animal products.
Low body weight
Being underweight could mean you're always cold for two reasons. Fat acts as an insulator, so having less fat could mean you can't retain heat well.
Additionally, cutting calories can slow your metabolism, giving your body less energy to heat up.
If you're trying to gain weight, it's recommended to stock up on high-calorie foods with good fats, such as nut butter, full-fat Greek yogurt, and dried fruit.
Dehydration
When your body doesn't have enough water, it can't circulate blood as effectively. Water also retains heat, meaning dehydration could leave your body without the temperature-retaining benefits of H2O .
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