hi Matt cool site. Am just about to start being like a caveman and was wondering best things to help with hunger pangs (got a lot of bad food habits) and am not very energetic. also i would need to lose 25 +kg and was wondering what sort of time span i should aim at. thanks for helping me motivate myself! 
Hi there, and thanks for dropping by.
Firstly, I would recommend getting a medical pre-screening from a registered doctor. It's important to see if there are any physical or dietary barriers. And if there are any barriers you would need to respect them, and work around them accordingly. For instance, low blood pressure or excessive weight would require a progressive approach i.e. start off easy and build your way up.
If you are eating and exercising as i've outlined on the website, you can expect to lose weight (fat) rather quickly, it wouldn't be unreasonable to lose 25 Kg in less than 3 to 6 months. However, this is ONLY if you are fundamentally healthy and your body can cope with rapid weight loss. Alternatively, a safer approach would be to to gradually lose weight over 12 months.
I've seen people lose over 20kg in less than 6 months, but they were generally young and healthy, and they were vigilant about meeting their nutritional requirements. So in essence; be wise about what you're doing, and don't jump into the deep end too quickly.
Hunger pangs (cravings) are common for people who are addicted to carbohydrates, especially those contained in bread, sweets, pasta, rice, and sweet drinks (including orange juice). And upon cessation of such unnecessary foods, you will find that your body craves these things for several days, but the cravings will drop to tolerable levels after that time.
To combat the cravings, I would recommend adding more fat to your diet, and less carbohydrates. Good fats include; Extra Virgin Olive Oil, Oily Fish (Salmon, Sardines), Free Range Eggs and Nuts. Eating these types of foods will fill you up and keep you full for longer times. And most importantly, it breaks the body's addiction to carbohydrates.
I encourage you to learn about good fats, and what foods to find them in. They usually are incredibly tasty, and very satisfying. Avoid bad fats such as those found in deep fried foods, and grain fed meat. Grain fed meat (and eggs) have a higher proportion of Omega-6 fats. What you need is a nice proportion of Omega-3 fats.
The paradox of eating more fat and less carbohydrates is simple; fats fill you up for a long time, and carbohydrates make you crave more, it's the heroin of food. Once you start, you can't stop. For example; the typical person may consume high-carb cereals for breakfast, and as a consequence they crave more food 3 hours later. However, eating a low-carb breakfast will not cause this "rebound" effect.
In summary; feed your cravings with healthy fats. And remember, as far as food types go; fat does not make you fat - addiction to carbohydrates makes you fat.
Also, remember to drink plenty of water, because protein requires more water than carbohydrates for metabolising. And eating more fat usually means you'll be getting more protein.
Yell out if you have any more questions.
