Daily Calorie Needs Calculator
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The UK Department of Health's Estimated Average Requirements (EAR) are a daily calorie intake of 1940 calories per day for women and 2550 for men. Since most adults in the UK lead a sedentary lifestyle, these figures apply to adults with low activity levels. How many calories are needed each day can vary greatly
depending on lifestyle and other factors. Variables that affect your personal daily calorie include your age, height and weight, your basic level of daily
activity, and your body composition. How to Sensibly Lose WeightIf you want to lose weight you should try to increase the amount of exercise you get and decrease your daily calorific intake. To lose approximately half a kilogramme or one pound a week you need a negative calorie balance of 500 calories per day. To lose weight at nearly 1kg a week you need to reduce your calorie intake by 1000 calories a day.The Weight Loss PlateauOver time our bodies adapt to the lowered calorie level. Our body becomes more efficient at using energy (lowered metabolism), and therefore burns less fat.This is why most of us reach a weight loss plateau. At this point, the only option is to boost metabolism; increased cardio, weight training, 'cheat' meals (i.e. high-calorie meals), cycling (or zig-zagging) calories, and even manipulating macro-nutrient ratios can all help to do this (don't forget adequate sleep and hydration). You often find that the nearer you get to your goal weight or body fat percentage - the harder things get! Continually dropping calories only serves to lower metabolism even further. The moment you return to 'normal' eating the weight comes back on. Minimum Daily Calorie IntakeIt is difficult to set absolute bottom calorie levels, because everyone has different body composition and activity levels. Health authorities do set some baselines - these are 1200 calories per day for women, and 1800 calories per day for men. This doesn't really make too much sense - are you are sedentary person with little muscle mass? Or someone who is tall, muscular, and exercises a lot? Absolute levels don't work, but do give us a starting point.Try not to lower your calorie intake by more than 1000 calories below maintenance. Doing so may invoke the bodies starvation response, which can lead to a yo-yo dieting effect. Try to gradually lower calories. A sudden drop (such as 500 calories or more) can cause your metabolism to slow. What happens when calories are too low? 1) Muscle mass is broken down for energy (catabolism). 2) Metabolism will begin to drop (typically) after 3 days of very low calories. 3) Loss of muscle mass will also lead to lowered metabolism. 4) With very low calories you risk sluggishness, nutritional deficiencies, fatigue, and often irritability. You are completely set-up for a regain in fat if you suddenly return to your previous eating patterns. 
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