| I'm not sure if the treadmills here in Australia are different to the ones in the USA, but when walking briskly on the treadmill, my speed is around 6.2. When I have bursts of jogging, I put it up to around 8.5. 3.5 seems extremely slow, but like I said, they may be different.
If you are looking to lose weight, you will need to intensify your cardio exercise to raise your heart rate enough to start burning fat.
Drink 2.5-3 litres of water a day, and keep a balanced diet. I find eating smaller meals (including tonnes of salad and vegetables) every 2-3 hours keeps my metabolism on a high. Also, like Rick said, you need to burn more calories than you take in to lose weight.
Sunflower seeds are full of nutrition (and tasty), just be careful how many you have as they are very high in calories.
Hope this helps! |