You'll probably want to eat more! Just adjust as you go. I'm vegan too and I do some pretty intense workouts and I'm always adjusting. Actually that's pretty good advice no matter what sort of diet you follow!
It's hard to get 1400 calories if your diet is primarily vegetables because vegetables are so bulky and fill you up fast even though they don't have many calories. I can barely eat 1 cup of brussel sprouts without feeling full. So I sympathize.
I am a vegan as well as a runner. In order to get enough protein in my diet, I add a scoop or two (for runs lasting over 2 hours) of protein powder to my after workout green smoothie. I like Sun Warrior and Vega brands, but have also made my own (the recipe can be found here: http://www.dailygarnish.com/recipes?recipe _id=6000070). I don't know if this helps, but for me, the extra protein makes a huge difference in my energy level and amount of fatigue.
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I think the best way to figure out what YOUR body needs is to try different combinations of food. Everyone has an opinion but what it all comes down to is figuring out what YOUR body needs to thrive. Play with your diet and see what happens.
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If you're having trouble reaching 1300-1400 cals, you've likely adapted to a lower calorie intake (metabolism has slowed). If you start eating more, after awhile your metabolism will fire back up and you'll be hungrier and able to eat more. I find, the more you eat... the hungrier you'll feel (once your body adapts). The same goes for eating too little... your body eventually adapts to that intake and you no longer experience hunger on a low intake of calories.
So it's just a matter of increasing your calories slowly and your body will adapt.
Male professional athletes and body builders may eat around 5000 cals. The average person, especially a woman does not require that many calories. I workout at high intensity 5-6 days a week (for 60-90 mins) and weight train and am active outside of exercise and I eat around 2000 cals to maintain my weight (around 1600-1700 cals to lose).
Your body goes into starvation mode after a prolonged extreme calorie deficit. As long as you are not losing weight too quickly, more than a rate of approximately 1-2% of your total body weight per week, it isn't something you should have to worry about.
Do you currently do cardio and strength training? I don't think a beginner to exercise should jump straight into high impact aerobics but a novice/intermediate level exerciser should be able to handle the program. If you already exercise, you shouldn't have to increase your calories by much. If you don't currently exercise, then yes... you may have to increase your calories a bit. Just add an extra 100 cals to each day for a week and then another 100 cals the following week until you reach your target.
You don't need supplements for a cardio program. In fact, you don't need supplements for a weight training program (which btw, Insanity will not provide you the same benefits of building muscle as an actual weight training program, it is an endurance program).
As long as you are getting what you need to supplement your Vegan diet then additional supplements for a cardio program are completely unnecessary.
According to Spark, you'll probably burn around 300-500 cals for an hour of Insanity (it's listed under "Aerobics: High Impact), depending on your personal information (age, weight, etc.) which is a typical amount of calories to burn during any high intensity cardio activity. You're not going to burn some impressive amount of calories like a that of a professional athlete. When it comes to cardio, you can only work as hard as your current fitness level will allow you. If you are not used to working in your maximum heart rate and sustaining it for prolonged periods of time, you will not burn as many calories as the claims from programs like this. Invest in a heart rate monitor for a better idea of how many calories you burn.
I eat whole grains such as spelt, oatmeal, etc that are organic, not processed like in bread, or pasta. I follow the vegan food pyramid to guide me about what I need to eat so I get my recommend dietary intake each day. Sometimes it is hard for me because I feel so full so fast but I manage because I know how important it is that I eat the foods I need since I'm not eating meat, or dairy. My problem is I want to start doing the Insanity program. Right now I eat about 1,300-1400 calories a day. Will I be okay starting the Insanity program on a vegan diet, and would I need to eat more. What if I can't? I have heard of people who need to eat 5000 calories a day because they are so active. I could never, ever do that.Will my body go into starvation mode if I don't plan my meals correctly? Is the Insanity program just something I shouldn't do? I don't have a lot of money to spend on tons of supplements, but I do plan to buy vegan protein powder and I do take a vegan multivitamin.
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