Can doing sports activity in heat accelerate fat loss ?

Not advisable: You should be very careful doing sports activity in the heat. Dehydration heat exhaustion and finally heat stroke can be the consequences of this type of activity. You apt to lose water more than fat.

Probably not: You will lose more water however. If fat loss is your goal, then exercising in heat may actually be counter-productive because you will tire out more quickly from the heat and therefore not exercise as long and hard as you could in a more comfortable temperature. Also you need to cut down on any fats/oils in diet and excess carbs in order to accelerate fat loss. Hang in there, it takes many wks

Burn more calories: Exercising at the same intensity level in hot versus cold weather will burn more calories, but not by any particularly significant amount. So overall you are likely to pretty similar weight changes exercising in hot compared to cold temperatures.

Burning fat: The temperature of the climate in which you play or exercise will not determine fat burning. What determines fat burning is the actual energy required by your muscles as you exert yourself - and whether there is glycogen still in your muscles and liver -- when glycogen is used up for needed energy, then adipose burning takes over - the best way to burn fat is to exercise after fasting --intensely

No: Since the body reacts more slowly to hot weather than cold, hot benefits only if you are exposed for a long period of time. You REALLY have to stay well hydrated. So, you actually burn more calories in cold weather - tough in Brazil, I guess! If you want to burn more, you can increase your intervals, for example, with short bursts of high-intensity exercise. Hope that helps.