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My problem is that having to pop a bunch of pills morning and night makes me instinctively think that a diet where you have to do this is lacking.
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I've just heard so many conflicting things about supplements that I'd like some clarity. Some have pointed out that everyone should take supplements, and the fact that low carbers tend to take more of them is just an indication of careful attention to diet.
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You bring up some very good points!
First, I think it's important to point out that most scientists and medical professionals today believe taking a multivitamin with or without additional supplements is a good "safety net" for meeting micronutrient requirements. The general consensus is consistent here, regardless of the mix of macronutrients in the diet - and basically is that there is little to no harm and even a possible benefit to taking vitamins & minerals in addition to eating well.
Now, that said - the real question is do we need to?
For a number of reasons I personally think adding some vitamins and minerals is a good idea.
1. With commercial farming practices what they are today, it's difficult to accurately measure the nutrient-density of our food available in grocery stores. Produce is often picked well before maturity (which reduces nutrients) and various feeding methods alter nutrients in animal foods. Because of this, I strongly recommend eating organic as much as your budget allows and to choose local growers of produce where you can with known practices - and to eat in season, ripe as much as possible!
2. In every analysis I have done of low-fat menus - I've yet to find one that fully meets or exceeds all RDA/AI recommendations in a single day or on average over a week. On the other hand, I've created hundreds of menus that are low-carb and do just that. The problem though is time involved for most people - unless you have the time to carefully plan your menus to meet/exceed nutrients, it's not a given you'll do so just eating low-carb. It takes careful planning and knowning which foods offer the greatest nutrient density bang.
Specifically to low-carb ---
3. Some of the recommended supplements are to aid weight loss rather than make up for a lack of intake - for example some of the amino acids, omega-3s, and trace elements like chromium picolinate all may help make weight loss and/or cravings easier.
4. Some of the supplements recommended are to provide a higher level of essential nutrients that are more difficult to achieve in diet alone - cod liver oil, fish oils, and flax oil all provide omega-3 (cod liver oil Vitamin D too) and may boost previously low intake levels over the years past. The increased intake of omega-3 may also help to achieve a better ratio of O-3:O-6 intake - it really depends on how much vegetable oils you eat as part of a low-carb diet.
5. Initially, as you strictly reduce carbohydrate, you do lose a good amount of water as glycogen is depleted. Depending on the intake of vegetables, selection of meats and calories - you may or may not eat enough potassium to maintain an optimal electrolyte balance. Oh - and let me be clear - this is a risk at the start of weight loss for ANY dietary approach...low-fat or low-carb! If you eat a lot of foods high in potassium, you probably won't need to supplement.....but sometimes it's not easy when you start since often you might not have learned the potassium rich foods yet!