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RapidKnowHow > Health: Lost Life Years (LLY) Baseline Lifeyears > Smoker / Non Smoker > Normal Weight / Overweight > No Sports / Daily Sport > Positive Stress / Negative Stress > Creating a Formular and Calculating the Impact in Lost Life Years > Conclusion

To create a formula to calculate the impact on expected lifetime based on lifestyle choices, we will need to include various factors like smoking status, weight category, physical activity level, and stress type. Each of these factors can have a quantified impact on life expectancy, which we can combine to estimate the total impact on lost life years.

Here’s how we can approach this:

Step 1: Establish the Baseline Expected Lifetime

Let’s assume a baseline expected lifetime of 80 years for simplicity. This number can vary based on geographical region, gender, and other factors, but we’ll use it for our calculations.

Step2: Define the Impact of Each Factor

We need to assign hypothetical life years lost or gained due to each lifestyle factor:

Smoking Status:

  • Non-smoker: 0 years lost (baseline).
  • Smoker: 10 years lost (based on research showing a significant reduction in life expectancy).

Weight Category:

  • Normal Weight (BMI 18.5 -24.9): 0 years lost (baseline).
  • Overweight (BMI 25 -29.9): 3 years lost (some studies suggest a moderate impact).

Physical Activity:

  • No Sports: 5 years lost (sedentary lifestyle is linked to various health issues).
  • Daily Sport:0 years lost (active individuals often live longer).

Stress Type:

  • Negative Stress: 5 years lost (chronic stress is linked to health problems).
  • Positive Stress (like moderate challenges):0 years lost (may even promote longevity).

Step3: Create the Formula

Now we can create a formula to calculate lost life years (LLY):

[ \text{LLY} = \text{Life Years Lost from Smoking} + \text{Life Years Lost from Weight} + \text{Life Years Lost from Activity} + \text{Life Years Lost from Stress} ]

Step4: Example Calculated Lost Life Years (LLY)

Let’s calculate LLY for each lifestyle combination to understand the impact:

  1. Non-Smoker, Normal Weight, Daily Sport, Positive Stress: [ \text{LLY} = 0 +0 + 0 +0 = 0 ] Expected Lifetime: 80 years
  2. Smoker, Overweight, No Sports, Negative Stress: [ \text{LLY} = 10 +3 + 5 +5 = 23 ] Expected Lifetime: (80 – 23 =57 ) years
  3. Smoker, Normal Weight, Daily Sport, Positive Stress: [ \text{LLY} = 10 +0 + 0 + 0 = 10 ] Expected Lifetime: (80 – 10 = 70 ) years
  4. Non-Smoker, Overweight, No Sports, Negative Stress: [ \text{LLY} = 0 +3 + 5 +5 = 13 ] Expected Lifetime: (80 – 13 =67 ) years

Conclusion

From the calculations above, we can conclude that lifestyle choices have a significant impact on expected lifetime. For instance:

  • A non-smoker who maintains a healthy weight, engages in daily physical activity, and experiences positive stress has the potential to reach the baseline expected lifetime of 80 years.
  • Conversely, a smoker who is overweight, sedentary, and experiences negative stress may see their lifespan drop significantly to about 57 years.

These calculations highlight the importance of making healthier lifestyle choices to maximize life expectancy. It’s essential for individuals to consider the comprehensive effects their lifestyle has on their health and longevity.