Yes as long as you are doing long walks.
“In order for your muscles
to use stored fat to fuel muscular activities, oxygen must be present at the site of the muscle. Unlike glycogen, which is the form in which your body suspends sugars, fat cannot be broken down in the absence of oxygen
, Therefore the more efficient your body becomes at taking in, transporting and delivering oxygen, the grater will be your ability to burn up any excess fat. Getting out of breath when you exercise is a sign that you are unable to provide your muscles with sufficient oxygen for them to work aerobically. When this occurs, your muscles will be relying on the breakdown of sugars (glycogen), and an organic compound called creatine phosphate, rather than using fat to supply their fuel needs. Exercising as intensely as you can, therefore, is not the best approach for fat burning. Adopting an intensity that you can sustain for an extended duration is far more effective. Walking briskly for an hour will result in far greater fat combustion than ten minutes of all-out effort.”