Hmm well to be honest, not enough water. Water might initially make you add a little more weight and make you go to the toilet more often (very annoying, I need to go right now actually) but it keeps your body hydrated and promotes the moving of fat cells ready for energy use. I drink about 5-6 600mL water bottles a day so that adds up to about 3L/day. To be honest, it's not that hard, if you have a bottle of water next to you, it will be downed without you thinking.
Hmm, ok - diet isn't for everybody, you can try the 3 days on diet 3 days off. It's popular to get into the rhythm. Die hard dieting NEVER works with new comers and it's not for the light hearted. Hell even the pro's cheat! Speaking of cheat, this is different to everybody, some people cheat by eating maccas and some cheat with more meals than normal. When I cheat I go ballistic, I do feel better the next day though.
For 3 days you can eat clean foods such as baked chicken and beans for lunch, tuna + wholemeal bread, cottage cheese + peanut butter, protein shakes, rolled oats + bannana + honey, multi vitamins, fish oil, apple. They would be the staples of my healthy days with an eye on portions. Off days I would eat "cleanish" fast food, subway, maccas burger for lunch rather than dinner without the chips and coke (last option for cutting man, really but one wont hurt u every now and then), etc.
It's just common sense really. Eventually you will be able to look without thinking whats good and whats not but the start is always hard.
My diet is pretty intense and some people can't do it/can't stick to it;
Bacon and eggs + flax oil
non lean beef patty + cheese + flax oil
tuna + oilive oil
avocado + egg + beef + cheese + flax + lettuce + ranch/mayo
beef + cheese + lettuce + flax
peanut butter
They call it ketogenic, its when your body enters a state of ketosis producing ketones, it happens when your body switches to fat for fuel rather than carbs. It might sound unhealthy but think of man pre the pastas, breads, etc. All we use to eat was protein and fat mainly veggies have fibre so the carbs don't count, with seasonal carbs from fruits. Eskimo's are still ketogenic to this day, they don't have banana trees there do they? Salmon is their staple, excellent source of fat and protein.
All the fat turns alot of people off, it increases your LDL which is good and lowers glucose levels in the blood. Many miss the cabs, I sure do, I LOVE pasta, so you reward yourself with a one day a week carb up day when you eat the carbs you miss. This is once your body is into ketosis, otherwise 2 weeks with no carbs is a must.
Good thing about ketosis is that it is protein sparing, so when you're running low on energy you won't decay muscle, unlike carbs. You simply eat away bodyfat!
I have friends who have ketobulked and not put on bodyfat, just muscle, and lost fat weight great results.
IMO, I would not try it until you are use to the idea of weighing food and being strict. It's either keto or not, you can't be half arsed.