BMI – יכול להיות שהרוב המוחלט טועה ?
"ג'ניה , אני צריכה לרזות 15 קילו, אני בעודף משקל רציני" איך את יודעת שואל ג'ניה(שדרך אגב זה אני),"זה קל, לפי ה- Bmi כמובן",זו אחת השיחות הנפוצות בין המתאמנות שלי וביני.
אולי בזכות המאמר הזה ישתנו סדרי עולם. ה-BMI משמש ככלי למדידת יחס משקל- גובה, ולפי זה לאמוד עד כמה אנחנו בטווח ה"בריא", כל זה נשמע נחמד וטוב בתיאוריה ,אך הפרקטיקה מספרת לנו אחרת.
בדיקת ה-BMI היא הבדיקה הכי לא רלוונטית במידה ורוצים לבדוק האם אנחנו בעודף משקל או בתת משקל, זו אינדיקציה הכי כללית שקיימת לבדיקת תקינות המשקל שלנו.
מה הסיבה ש-BMI זו בדיקה שגוייה?
מדד ה- BMI שגוי מכיוון שהוא עובד לפי פרמטרים של גובה ומשקל, בואו נצא מנקודת הנחה שיש לנו אישה בשם רינת אשר משקלה הוא 70 קילו וגובהה הוא 1.60, אך כעת נכניס נתון נוסף של אחוזי השומן שלה אשר עומדים על כ 25% ,ומנגד אישה בשם ליטל.
ליטל בעלת נתונים זהים אך בדיקת אחוזי השומן שלה מראה שלליטל יש כ- 40% שומן בגופה, במצב כזה מדד ה- BMI יראה אותה תוצאה, מכיוון שלשתי הנשים אותם נתונים(גובה ומשקל), אך במציאות שתי הנשים הללו יהיו רחוקות שנות אור אחת מהשנייה, הן מבחינת המראה והן מבחינת המצב הבריאותי.
אז איך אני אדע אם המשקל שלי תקין?
בגדול אינכם צריכים להסתכל על המספר של הקילוגרמים שהמשקל מראה לנו (אלא אם כן הוא מראה 130 ,ואינכם ספורטאים, תדעו שזו נורה אדומה, ואם תמשיכו בקצב הזה, הנורה תתנפץ)אלא על מספר אחוזי השומן, איך תדעו איזה אחוז שומן הוא מחוץ לטווח הבריאות עבורכם, בקלות:
לטבלה ולמאמר על אחוזי שומן ,ליחצו כאן
לסיכום:
ה-BMI הוא מדד ישן ולא רלוונטי לעולם שאנו חיים בו כיום,הוא הומצא בזמן שהטכנולוגיה הייתה בקושי "טכ"(נו מאוד מזמן, הבנתם אותי),בתקופה ההיא עוד לא הכירו את נפלאות מדד אחוזי השומן,אך קצת התקדמנו מאז. דרך אגב
דיאטנים ואנשים שעוסקים בתחום, אשר ממליצים על הבדיקה הזאת כמדד לבדיקת תקינות המשקל, כנראה לא מעודכנים.
אני אחזור על זה בפעם האחרונה, הבדיקה מתאימה לאנשים לא מאומנים עם גנטיקה "רגילה", וגם שם זה מאוד בסיסי ולא מדוייק. אשמח לשמוע מכם, בתגובות פה למטה, מה דעתכם על המאמר, ועד כמה הוא תרם לכם?
ג'ניה רומסקי,
המאמן האישי שלך,
לחיי הבטן השטוחה שלך.
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