Weight

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 16px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.x.axis path {
  display: none;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 5px;
}

div.tooltip { 
    position: absolute;     
    text-align: center;     
    width: 140px;          
    height: 40px;         
    padding: 2px;       
    font: 16px sans-serif;    
    background: lightsteelblue; 
    border: 0px;    
    border-radius: 8px;     
    pointer-events: none;     
}

</style>
<body>
<script src="https://d3js.org/d3.v3.js"></script>
<script>

var margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var parseDate = d3.time.format("%d/%m/%Y").parse;

var formatTime = d3.time.format("%e %B %Y");

var x = d3.time.scale()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var line = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.Date); })
    .y(function(d) { return y(d.Weight); });

var div = d3.select("body").append("div") 
    .attr("class", "tooltip")       
    .style("opacity", 0);

d3.csv("https://docs.google.com/spreadsheets/d/e/2PACX-1vSAJC6Bj_1ij2nPZarqpBmHL0xqd3W7iwKi3aqP-rR-Chf0o1QdqqZwBELTd-YaV7_bg4tTO8DXy0C-/pub?gid=1&single=true&output=csv", function(error, data) {
  data.forEach(function(d) {
    d.Date = parseDate(d.Date);
    d.Weight = +d.Weight;
  });

x.domain(d3.extent(data, function(d) { return d.Date; }));
  y.domain(d3.extent(data, function(d) { return d.Weight; }));

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Weight (kg)");
  
  var lx = [];
  var ly = [];
  
  for (var i = 0; i < data.length; i++) { lx[i] = data[i].Date / 1e12; ly[i] = data[i].Weight; }

var yOut = loess(lx, ly, 0.2);
    
  var data2 = [];

for (var i = 0; i < data.length; i++) { data2[i] = {}, data2[i].Date = data[i].Date, data2[i].Weight = yOut[i]; }
    
  svg.append("path")
      .datum(data2)
      .attr("class", "line")
      .attr("d", line);
      
  svg.selectAll("dot")
    .data(data)
    .enter().append("circle")
      .attr("r", 5)
      .attr("cx", function(d) { return x(d.Date); })
      .attr("cy", function(d) { return y(d.Weight); })   
       .on("mouseover", function(d) {   
          div.transition()    
              .duration(200)    
              .style("opacity", .9);    
          div .html(formatTime(d.Date) + "<br/>"  + d.Weight + "kg")  
              .style("left", (d3.event.pageX) + "px")   
              .style("top", (d3.event.pageY - 28) + "px");  
          })          
      .on("mouseout", function(d) {   
          div.transition()    
              .duration(500)    
              .style("opacity", 0); 
      });
});

</script>

https://d3js.org/d3.v3.js