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Béo bụng làm tăng nguy cơ bị mù mắt

(Dân trí) - Tăng cân ở tuổi trung niên sẽ làm tăng nguy cơ bị mù ở nam giới về sau này, một nghiên cứu tại Australia cho thấy.

Sự gia tăng kích cỡ vòng bụng đặt nam giới vào mối nguy mắc bệnh thoái hóa điểm vàng do tuổi tác, một trong những bệnh gây mất thị lực hàng đầu ở nhiều quốc gia.

Ngay cả khi sự gia tăng kích thước vòng bụng rất nhỏ cũng làm tăng nguy cơ mắc bệnh thoái hóa điểm vàng ở nam giới lên 75%. Tuy nhiên, nữ giới lại hoàn toàn không bị ảnh hưởng. Sự khác nhau về giới tính này được cho là do hooc-môn nữ oestrogen.

Mỡ bụng tiết ra oestrogen cho cơ thể thể và nghiên cứu trên động vật cho thấy hooc-môn này có thể gây viêm mạch máu ở sau mắt. Những phụ nữ luôn có mức oestrogen cao hơn cánh nam giới trong cả cuộc đời vì vậy mắt ít bị hooc-môn này tác động.

Các nhà nghiên cứu ở ĐH Melbourne đã theo dõi sự thay đổi của vòng eo của hơn 21.000 người trong độ tuổi 40-69 trong vài năm và cũng chú ý xem có bao nhiêu người bị thoái hóa điểm vàng.

“Có bằng chứng cho thấy viêm nhiễm mãn gây bệnh thoái hóa điểm vàng và béo phì là một dạng siêu viêm nhiễm”, các nhà khoa học cho biết.

Nghiên cứu của chúng tôi đã rút ra 1 kết luận quan trọng đó là béo phì vùng bụng làm tăng nguy cơ bị thoái hóa điểm vàng.

Các kết quả cho thấy chỉ cần có thay đổi nhỏ về tỉ lệ vòng eo và hông ở nam giới là có thể khiến nguy cơ thoái hóa điểm vàng ở mắt tăng rõ rệt. Tỉ lệ lý tưởng là dưới 0,95 và bất kỳ mức tăng nào cũng làm tăng nguy cơ bị tiểu đường và bệnh tim mạch. Và theo nhóm nghiên cứu, cứ tăng 0,1 tỉ lệ vòng eo/vòng hông thì nam giới có nguy cơ bị thoái hóa điểm vàng ở mắt tăng thêm 75%.

Phát hiện này đã củng cố cho phát hiện năm ngoái rằng chế độ ăn là một trong những yếu tố làm tăng nguy cơ thoái hóa điểm vàng ở mắt.

Người ta phát hiện ra rằng ăn 10 khẩu phần thịt đỏ trong 1 tuần sẽ làm tăng 50% nguy cơ thoái hóa điểm vàng ở người trưởng tành. Nhưng nếu ăn 3 bữa gà/tuần thì lại giảm 50% nguy cơ.

Nghiên cứu tại Anh cho thấy ăn nhiều hoa quả, rau xanh và các loại hạt họ hạnh nhân sẽ giúp giảm 20% nguy cơ bị bệnh.

Rõ ràng, một lối sống lành mạnh sẽ giúp ngăn ngừa nhiều bệnh tật.

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Béo bụng làm tăng nguy cơ bị mù mắt

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