Nikola also wrote an article explaining how Body copy in magazines should be set. I found this very interesting and useful, and will take her advice when designing my grid layouts.
Probably the most important magazine page element
is the body text or body copy as some refer to it. Magazine readers do
not notice properly set body text. They notice nice images, powerful
headlines, but they do not notice body text. And this is a good thing.
Properly adjusted body text should be unnoticeable and it should not
interfere with the process of reading. It should be invisible so that
the reader is never aware of the reading process.
On the other hand, if the body text is not set properly, this can
lead to bad readability and it can annoy potential readers, but for us
editorial designers this is the first thing we should do and if the
result is unnoticeable than you know you did a good job.

The
visual difference is obvious between the different fonts in same sizes.
Lyon looks dense and page filled with this font would be too dark. On
the other hand, Garmond looks spacious and would produce page that is
too bright. In this size and in these settings, Caslon seems like the
best choice.
Choosing body text font
When choosing a proper body text font, choose the ones that will suit
your publication. You can choose sans serif fonts that have proven to
be a great choice for body text. Some of them are Caslon, Jenson,
Chronicle, Miller, Palatino, Garmond and Goudy to name a few. Although
they are popular, never ever use Didot and Bodoni or any similar font
for body text. They are not intended for display at small sizes and for
lengthy article reading because of their big contrast in thick and thin
strokes.
If you choose a sans serif type you can choose from the usual
suspects like Helvetica, Franklin, Univers, Gill sans, Meta, Swiss and
so on.
I personally rarely use sans serif fonts for body type. For longer
feature articles I almost always go with serif type and I leave sans for
smaller sections and text in boxes, but no one says you cannot choose a
sans serif for longer articles. It all depends on the nature of the
publication.
Though sans serif fonts is a bit harder to read than serif fonts, you
should increase the leading up to 135-140% for easier line to line eye
transition.
Pick one font and use it for all body text in the entire magazine.
Body text sizes
When designing a magazine from the scratch first thing you should do
is to choose the body text font and its size. It all starts from there.
There are no strict formulas for setting the proper body type by itself. The size of the body text should work with the
width of the column and
it should be appropriate for the targeted audience. Let’s say that the
majority of your readers will be seniors, 60 years and older. For them
the size of body type should be larger. The same principle applies to
small children.
Body text sizes can range from 9pt to even 12pt. Although I have
never set any body text in 12pt. There is no one size fits all
principle, but do not go bellow 9pt and do not go over 12pt. Newspapers
are usually set in 10pt, but this is not a rule set in stone.
The size also depends on the x-height of the font selected. X-height makes type look big or small.
Leading should be set at default 120%. For narrower columns you can decrease it and for wider you should increase it.

Body
copy aligned left with 3mm indent on the first line of each paragraph
and with horizontal rules in between the text columns.
Body text alignment
There are only two options for body text alignment. Left and justified. Never centered and never aligned right.
There are almost no differences in readability of text aligned left
and justified. If you plan to use justified alignment, adjust properly
its
justifying settings.
Text aligned left can provide some valuable white space in text
columns and it does not create a dull horizontal look like justified
text columns.
Sometimes you can use vertical thin rules to divide the text columns
of text aligned to the left. It will make these columns look tidier but
if your text is justified, there is no need for vertical rules between
the text columns are already perfectly straight in a vertical line.
Each paragraph of text can have a horizontal indent in the first line of the paragraph. The paragraph just bellows the
subhead
does not have to be indented. Indent should be from 3-5 mm, depending
on the width of the text column. Instead of indent, you can use
drop caps at the beginnings of the paragraph, but do not over do it. Also never indent the paragraph that has drop cap applied.
After you have set the size, leading and alignment, create few
columns and fill them with dummy text. For example, create three columns
spreading from top margin to bottom margin and place some text in them
with the settings you have chosen.
Print one page and take a look at it. Does it look too gray? Is it
too bright? This is called the texture of body text and it should be
optimal, neither too dark neither too bright.
Try out some different point and leading sizes, create columns, fill
them with text again, print and compare. See which ones look better.
There are no rules and the best result will be the one that looks
optimal. Read the text in the columns and if you can read it with a nice
flow and without interruption you have made it.
Reading comfort depends on the ratio of type size to line length to
line spacing and they all have to be in balance and you are the one that
is setting this comfort for the reader so choose wisely.