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== No intercept constraint ==
== No intercept constraint ==
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Unfortunately a total free approach can give nonsense results. A total free approach does not assume anything.
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Unfortunately a total free approach can give nonsense results. A total free approach does not assume anything. So it will use the intercept as free variable as well. This is clearly nonsense, as it implies that a product has nutrients even if there are no ingredients. So we need to enforce an offset of zero.
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As we thus limit the possibilities, the degrees of freedom go dwon. Does this mean that we can fit one ingredient less as well?
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== Positive ingredients only constraint ==