Are you hungry because you: A. Are really craving bread/sweets? B. did not eat enough protein and fats? C. Or did not drink enough water and feel a little dehydrated?
The test someone told me about was if I was really hungry, eat 6oz of steak, if not appetizing, not really hungry, just a craving.
Stick with it for 30 days, you'll thank yourself.
I recommend reading The Primal Blueprint to build a foundational knowledge-base on why eating paleo/primal is the best for achieving optimal health. It's not necessary, but it helped me understand the WHY of it. Then, take advantage of the zillions (okay, not zillions), but many blogs and websites dedicated to a paleo lifestyle.
It took a year of my friends convincing me to eat paleo (was a vegetarian/vegan and a 5-day a week cardio junky) before I took the plunge. After a week, I knew it was a life-changing thing for me. Take it slow, get educated and don't pile pressure on yourself. It takes a while to get out of the SAD (Standard American Diet) weight-loss mindset (low-fat, calorie counting, etc). Just be patient with yourself and try not to focus too much on the numbers (the scale, especially).
Maybe start off with trying the Whole30, that will give you some structure: http://whole9life.com/2012/01/whole-30-v2012/
Eat more. Especially when you're starting out, let yourself eat to satiety. Meat, eggs, fruits, vegetables. Eat some fully fat dairy if you'd like to include it. Don't try to go through the transition while you're hungry.
Though dairy is not technically Paleo- it really helps me and I'd suggest it if you can tolerate dairy (I do fine with it) I make my own yoghurt from raw milk that comes from grass fed cows or buy full-fat plain Sheep's milk yoghurt from Whole Foods. It really helps me stick to being otherwise 100% Paleo.
If I am just eating meat, sweet potatoes and veggies, even with generous amounts of ghee and coconut oil and fish oil I always feel deprived and never really full. Adding some yogurt in there makes me feel 100% better.
My solution for myself is to eat more fat--a little coconut oil in my coffee in the morning helps me. If I don't eat fat then I'm confronted with the "am I really hungry?" question way too often.
You need to change your eating patterns. Your weight loss will be quicker and easier if you eat healthier but that isn't really what this is about.
You should be eating smaller meals more often. You don't necessarily need to cut down your total calorie intake but you do need to spread it out over a longer period of time. Instead of those three meals, divide you food intake into at least five and preferably six smaller meals spread out over the course of the day. Exactly when you eat them should be determined by when you get hungry. Don't eat if you aren't hungry, but don't let yourself get famished.
Eliminate as much stress as you can from your life. The largest factor that causes you to eat when you aren't hungry is stress. Eating releases chemicals in your body that make you feel better. By eliminating the stress you will be eliminating the need that your body has to feel better through eating.
I am only into this for a couple months and I also suggest eat til you are full. Do you have weight loss goals or are you eating paleo solely for the overall health benefits? If your weight isn't a problem, maybe eat more fruits and nuts to stave off hunger. What are your meals like? Are you eating lots of vegetables? They keep me pretty full. What are your proteins? How long have you been eating paleo?
Don't give up it gets easier and you will feel better!
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