That doesn't always work for all people. For example, I can lower my caloric intake, but if I still have the wrong mix of types of food, I can still gain weight.
I have "insulin resistance", and I think you touched on a tangent of that in your later comment about how bad grains are (for some people). For me, it means that any "high glycemic index" foods - like breads (white worst of all), potatoes, sweets, etc. - go right to fat for me, no matter how little else I eat or how much exercise I'm getting (unless I'm running 4+ miles a day).
I've managed to lose 38 pounds in the last 10 weeks by staying of the South Beach Diet Phase I regimen. That means following a simple, easy to remember rule: no GPS-AF. That stands for Grains (breads, pastas, rice), Potatoes (or other starchy vegetables, like corn or peas or carrots), Sweets (or sugared drinks), Alcohol, and Fruits or fruit juices. I'm a bit off my pace - now just 3.8 lbs/week, off of 4.6 lbs/week in November - but that's due to travel and some light goofing off at Christmas.
The great thing is that this is without exercise - now that I have energy back (the first month of this regimen will tire you out), I hope to get that pace back to 4.6.
I’m kind of the same way. I need to stay away from breads, rice, potatoes, just about anything with grains or starch. My weight piles right back on when I eat that stuff. Especially pizza, which is my all-time favorite food. I even lay off most fruits except for the low glycemic ones like blueberries and cherries.
no peas, carrots or fruits? I can understand the grain things but what is left to eat if no fruit?