Collagen and elastin help keep your skin firm. You may develop sagging skin with age due to the reduction of collagen and elastin production in your skin which causes the skin to lose its natural elasticity
Also, muscles that support your skin gradually weaken when age and may allow fat to accumulate in areas that form saggy portions of skin. Fluid retention can cause puffiness that forms saggy tissue as it progresses. Your skin gradually loses its ability to shed dead skin cells as you age, and all of this together could contribute to saggy skin.
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Extreme or rapid weight loss
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Genetics
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Lack of muscle beneath the skin
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Repetitive facial expressions
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Sleeping positions
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Smoking
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Sun exposure
You could prevent early sagging through
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Regular exercise can strengthen and tone the muscles supporting your skin
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Exfoliating your skin to shed dead skin cells and promote circulation to your skin.
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Staying hydrated and moisturizing help prevent fluid retention keeping your skin firm
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Applying sunscreen before going outdoors
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Skin products that contain yeast extract, aloe vera extract and soy protein may firm your skin by inducing collagen and elastin production
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Hyaluronic acid skin products can restore water to sagging, aged skin.