Sign my name to what Jynus said.
"Low fat" or "low carb" or "low whatever" is silly.
You need fat and you need carbs. In fact you need healthy fats to help your body process other nutrients. The only thing that will cause you to lose weight is to eat fewer calories than your body burns.
Here's my advice: Stop eating packaged foods, processed foods, convenience foods. Start looking at the ingredients of the things you buy. If there are added sugars, added chemicals, added preservatives or flavors or colors ... don't eat it. If it's not something you'd recognize as food in it's raw form, don't eat it.
A good rule of thumb for calories is to use 15 calories per pound of bodyweight to figure out what your "maintenance" calories would be (in other words, the number of calories you'd need to eat to stay where you are). Then subtract about 30% from that number.
For example, I weigh 174, so my maintenance calories would be around 2610. Subtracting 30% from that gives me 1827. I usually eat anywhere from 1700 to 1900, keeping towards the lower end of that on most days.
Once you've figured your calorie level, make sure you're getting an adequate amount of protein, carbs, and fats. It's not just about the numbers - you want to make sure that you're fueling your body properly.
Keep in mind that this isn't an exact science. Some people are more efficient at burning calories. Some people have damaged their metabolisms by years of yo-yo and fad dieting and it will take them a while to get back on track. Start with the 30% figure and if it isn't working for you, tweak it a little. Drop another 10% and see where that takes you. But just remember that you're not going to get immediate results.
And, further to that, remember that this is a moving target. AS you lose weight, you'll need fewer calories ... so periodically take stock of where you are and see if you need to eat less - or eat more.
Do it sensibly and slowly and don't expect "Biggest Loser" results. Just keep plugging along and you'll do fine.