Move to pasta made from other wholegrains, brown rice, lentils, quinoa, spelt, barley etc. Don't add too much salt or sweetness to your food. Use sweet potatoes rather than white ones. Cook with veggie sausage and mince etc. as they taste great, often have more protein but a fraction of the fat. Cutting back on cheese was a big thing for me (became intolerant and went vegan) I hadn't realised how much that was crapping up my diet.
Use a good nonstick pan or a well seasoned skillet with very little oil.
Ensure your carb to substance ratio isn't whack e.g. half rice half stir fry, move to more like 2/3 or 3/4 of the substance.
Just a few substitutions, cutting down on cooking oil (yes, there's nothing wrong with fat, but no need to do a stir fry or curry for two with a cup of oil)., watching ratios etc. Made a huge difference to me. The extra veg and wholegrains alone add nutrition to your diet and you don't need to go hungry.
If you like Chinese and Indian food, learn to make the sauces and masala yourself as you can make them a lot more virtuous (plus they'll usually taste better!).
None of the above requires you to look sadly at a lettuce leaf, eat artificial foodstuffs or sweeteners or restrict the styles of food you eat.
Oh and lay off the booze for a month, you'll feel much better!