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Based on GDA (Guideline Daily Amounts), the GDA for someone who has a BMR (Basal Metabolic Rate) of 2500 calories a day is:

Calories        2500.00 kcal
Protein           55.00 g
Carbohydrate     300.00 g
Sugars           120.00 g
Fat               95.00 g
Saturates         30.00 g
Fibre             24.00 g
Salt               6.00 g

How do I adjust the above values for 1525 calories a day. Please see my attempt below. I have concerns as some values look too high (carbs, salt etc) while others look too low (protein, fibre).

Here are my calculations:

Calories        1525.00 kcal
Protein           33.55 g
Carbohydrate     183.00 g
Sugars            73.20 g
Fat               57.95 g
Saturates         18.30 g
Fibre             14.64 g
Salt               3.66 g
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Your math is good, but consider the other points in my answer. –  Berin Loritsch May 4 '11 at 15:38
    
@oshirowanen, considering your series of questions, I'm wondering what your target goals are? If it's more than 10Kg, you might want to consider an unbalanced diet to lose the weight and then phase off of that to a balanced diet when you want to maintain. I used the "Ideal Protein" diet which originated from a Dr. Tran in France to lose my weight: fitness.stackexchange.com/questions/1696/800-calorie-diet/…. –  Berin Loritsch May 4 '11 at 16:51
    
@oshirowanen, I suggest you have a look at this blog post Because your titles and the information in your question could use some 'help' –  Ivo Flipse May 4 '11 at 18:54
    
Thanks for the edit @oshirowanan :-) –  Ivo Flipse May 5 '11 at 10:33
    
No problem, thanks for the link. About to make some changed to the question too. –  oshirowanen May 5 '11 at 10:36
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3 Answers 3

up vote 3 down vote accepted

Typically you would prorate it. That means if 1525 kcal (or Calories) is 61% of 2500 kcal you simply multiply everything by .61. However, there are a couple things to consider:

  • The amount of protein you need to consume to protect your muscles doesn't change.
  • The body needs at least 21g of Fibre a day to stay "regular" (i.e. no constipation)

In the other question you had, you figured out that you need about 65g of protein. Keep that number. I would also maintain the amount of Fibre they suggest. I personally need around 30g to stay regular.

Now, a nice little tidbit about carbs and fibre:

On nutritional labels, fibre is usually lumped in with other carbs. However, your body can't absorb the calories in the fibre so they really don't count. The concept of "net carbs" basically means subtracting out the fibre from the total carbs in the meal. If your English muffin (as we call them in the states) has 10g of fibre and 24g of carbs per muffin, the net impact on your body is only 14g of carbs. Just be careful with some of the "Atkins" labeled net carbs, as they also subtract out sugar alcohols which your body can absorb. Only subtract fibre.

Everything else, I would multiply by 61%. That would make it look like this:

Calories        1525 kcal
Protein         65 g
Carbohydrate    183 g (no more than)
Sugars          73 g
Fat             58 g  (no more than)
Saturates       18 g
Fibre           24 g
Salt            3.5 g

NOTE: I personally think the sodium number for the GDA is a bit high (for the USDA the recommended allowance is around 2.5 g to 3 g of sodium). I tend to swell up when I have that much.

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Thanks for the quick reply. If the protein is changed from 33g to 65g, won't that mean I end up with more than 1525 calories? –  oshirowanen May 4 '11 at 15:47
    
Not necessarily. Check the labels on your food. Basically you will be looking for foods rich in protein and lower in carbs/sugars/fat. For example: lean beef, chicken, fish are all excellent sources of protein. When you get your veggies, go for the veggies that are lower in sugars (like most green vegetables) or at least are high in fiber. You won't be able to have as many potatoes as you might of had in the past, but you'll be surprised at what you can have. Remember, if you have fewer than the GDA on carbs/fat/sugars it's OK. –  Berin Loritsch May 4 '11 at 16:05
    
Oh, if you get hungry, you can have as much lettuce as you want. Lettuce has vitamins and minerals in there, but that's about it. It has almost no calories or fibre, but it takes up space in your stomach. If you combine it with a Walden Farms (or equivalent) 0 calorie, 0 fat, 0 carb dressing you won't feel so deprived. Yes, the Walden Farms products are engineered food, but they are useful tools while losing weight. –  Berin Loritsch May 4 '11 at 16:09
    
+1 Good points re protein & fiber –  Greg May 4 '11 at 17:15
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Well, yes, your math looks fine if you're asking did you scale the nutrient breakdowns down with calories.

A much bigger question would be whether this guideline is worth following. That looks like an awful lot of sugar to me, especially if you want to lose weight!

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I think the sugars are part of the carbohydrates, as they normally write x about of carbohydrates of which x amount is sugar, so in total, the carbs plus sugars is 183g, i think... –  oshirowanen May 4 '11 at 15:49
    
is that guideline worth following? If not, which guideline should I be following if I want to lose 1 lbs a week, but make sure I remain healthy. I have tried reducing my calories in the passed, but end up feeling very weak and end up with all over join pains, I am assuming that happens because I am not getting enough nutrients. –  oshirowanen May 4 '11 at 15:58
    
@oshirowanen, it happens when you don't get enough nutrients and your body is robbing your muscles to burn for energy. 1500 calories is probably the lowest safe limit when you are simply restricting calories. –  Berin Loritsch May 4 '11 at 17:06
    
Consider that sugar is essentially "empty" calories, they do very little for you other than provide a quick jolt of energy, which is converted to fat if you aren't using it then and there. Just dropping the sugar consumption to a minimum will probably produce noticeable results. –  Greg May 4 '11 at 17:17
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I'd suggest you some diet tips:

  • When calculating your RDA (Recommended dietary allowance) for calories, protein, Carbohydrates, fat, fiber, salt etc.first check these factors. Because RDA always changes with these factors
  • Age, sex
  • Height, weight
  • Any disease condition (metabolic disorder)
  • Bowel habits
  • Physical activity (Exercise)
  • Lifestyle (sedentary, moderate or very active)

    Then follow these instructions

  • Multiply your BMR with activity factor e.g.20%, 30%, 40% accordingly and add that value in BMR.It is your basic requirement (RDA)
  • Then see what is your target for weight loss. If it is less than 10 Kg , no need to reduce 500 Kcal directly
  • Change the composition:Carbohydrates 65-70% of calorie value Protein 15-20% Fat 15-20% Simple sugars-25 gm/day Salt-4-6 gm according to climate condition
  • Add fiber gradually (raw veg,low calorie fruits)
  • Increase Protein gradually from 12%->15%->20%
  • Reduce amount of saturated fats
  • First think of maintaining the achieved weight & don't go below 1500 Kcal for long time. In between, plateau diets of less calories for 2-3 days can be taken; but come to normal (1500 kcal) after that.
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Care to explain a bit why you need some of these and perhaps what are good things to eat to achieve it? –  Ivo Flipse May 5 '11 at 10:35
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