No, the general rule is: Talk to your doctor if you're wondering if you should be taking supplements.
Your generalization potentially puts people in harms way.
A varied diet is not always enough - some vitamins and minerals affect how others are absorbed and whether or not they are available to your body. And heavy exercise can cause deficiencies if your diet doesn't contain enough of the substances that you lose while sweating, even if you do eat enough to maintain your weight and muscle mass.
I've experienced this personally. There was a time in my life where I was exercising significantly more than the average person, although obviously not as much as a professional athlete. Even though I ate enough to maintain my weight, and had a fairly varied diet, I still ended up with an iron deficiency that was almost dangerously low, and this was only caught when I had some blood tests done to help rule out causes for my sleep issues.
Most supplements aren't needed, but vitamins and minerals such as B12, D, calcium, and iron (and others, although most of those are less frequent and can take much less time to build up the necessary quantities in the body) can end up at problematic levels even when you think you're doing everything right.
Right, I know someone who has a severe potassium deficiency and through multiple methods (including but not limited to increased milk & banana consumption and a large potassium pill) gets to where blood tests return "low" rather than "dangerously low"
Your generalization potentially puts people in harms way.
A varied diet is not always enough - some vitamins and minerals affect how others are absorbed and whether or not they are available to your body. And heavy exercise can cause deficiencies if your diet doesn't contain enough of the substances that you lose while sweating, even if you do eat enough to maintain your weight and muscle mass.
I've experienced this personally. There was a time in my life where I was exercising significantly more than the average person, although obviously not as much as a professional athlete. Even though I ate enough to maintain my weight, and had a fairly varied diet, I still ended up with an iron deficiency that was almost dangerously low, and this was only caught when I had some blood tests done to help rule out causes for my sleep issues.
Most supplements aren't needed, but vitamins and minerals such as B12, D, calcium, and iron (and others, although most of those are less frequent and can take much less time to build up the necessary quantities in the body) can end up at problematic levels even when you think you're doing everything right.