Millions of people are overweight: and many of these would like to slim. Although exercise is often touted as a good way to lose weight it is slow.
It is much faster to reduce food intake. Although of course exercise is useful for many other health reasons. However the amount of exercise need to reduce even one calorie of weight is huge.
So - sorry! Reducing food intake is where it is at.
Or, rather, varying the type of food eaten may be just as important. For example, eating lots of salads, non-starchy vegetable and moderate amounts of fruit is great for your weight. So you can still eat lots - it's just that you have to watch what it is that you eat.
Funnily enough, fat per se is not what makes you fat! Of course saturated fat is bad for you: any fried food is a poor choice. But olive oil salad dressings and oil in avocdos is perfectly healthy - as well as filling.
To help weight loss, spirulina is favoured by some people. This can help probably because of an amino acid it contains which can help to supress appetite. In any case, spirulina is a great nutrient organism - so it can only do good. Try 4-6 with each meal.