The answer to your question is true
Keep portion sizes small
If the fast-food restaurant offers several sandwich sizes, pick the smallest. Bypass hamburgers with two or three beef patties, which can be close to 800 calories. Choose instead a regular- or children's-sized hamburger, which has about 250 calories. And skip the large serving of french fries and ask for a small serving instead. This switch alone can save 200 calories.
Choose healthier side dishes
Take advantage of the healthy side dishes offered at many fast-food restaurants. For example, instead of french fries choose a side salad with low-fat dressing or a baked potato. Or add a fruit bowl or a fruit and yogurt option to your meal.
Other healthy choices include apple or orange slices, corn on the cob, steamed rice, or baked potato chips.
The formula to get the maximum heart rate calculation is 220 - age. So, if someone is 47 years old, their average max. heart rate would be 220 – 57 = 163
