Avoiding fat is nothing more than "bro" science. Fat is a macronutrient that your body needs avoiding it is mad stupid.
Avoiding artificial sweeteners doesn't actually work it's like a meth head smoking crack so he can cut back on crack. The only way to reduce cravings for sweets is to slowly stop eating sweets. Artificial sweeteners also make a lot of people feel like shit.
At the end of the day most people cant stick to a diet, the shitty food they eat is literally addictive and they wont stop for long.
People who think that if they lift a weight they will get bulky (almost exclusively women) are idiots.
count your macros and exercise for 45 minutes a day, if you can stay in a calorie deficit you can eat literally anything you want and lose weight.